Why are environmental factors important to consider when assessing an individual’s health? a. environmental factors are the sole cause of health related issues. b. environmental factors are not important to consider, because they have no effect on an individual’s health. c. some health risks are increased by heredity, which manifest under certain environmental conditions. d. none of the above please select the best answer from the choices provided a b c d
c. Some health risks are increased by heredity, which manifest under certain environmental conditions.
The chance of contracting some diseases can arise in particular circumstances.The occurrence of certain diseases is influenced by certain environmental factors. Air pollution from a polluted environment increases the chance of allergic people or those with overactive immune systems acquiring respiratory conditions like asthma. A similar genetic flaw in melanin formation increases the risk of skin cancer in people who are exposed to UV rays. As a result, certain circumstances promote the development of disease.
Communities can lessen exposure to diseases and chemicals that have damaging effects on the body by focusing on environmental health. Environmental health treatments can improve everyone's quality of life, but they may be especially noticeable for people with pre-existing health conditions.
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1.) A building has two lifts. One lift stops only at even numbered floors and the other stops only at odd numbered floors. What is the advantage in operating the lifts in this manner, instead of both lifts stopping at every floor?
A. It makes sure that both the lifts are used for an equal number of trips.
B. It reduces the time taken to reach the required floor, as the lifts can move faster.
C. The total number of people that can be carried by two lifts is increased.
D. It makes sure that the lifts are always full while going up and while coming down.
2.) During winter in the temperate regions, days are short. Air samples taken since 1986, during winter in Canada which lies in the temperate region, show that the average atmospheric carbon dioxide concentration in winter is higher than it is in summer.
Which of the following statement is the most likely reason for this?
A. Plants breathe very little during the winter months.
B. More animals respire actively in the winter months.
C. The amount of photosynthesis taking place is less in winter.
D. Plants and animals use up stored food for respiration in winter.
3.) Parul has two colourless solutions P and Q. solution P turns red litmus paper blue. She mixes solutions P and Q together. On evaporation of the mixture she obtains crystals of common salt. Which of the following is solution Q likely to do?
A. Turn yellow turmeric paste red in colour
B. Cool down lime water when mixed with it.
C. Produce a gas when mixed with baking soda.
D. (Nothing can be said with just the given information.)
The answers for the following questions are given below
the advantage in operating the lifts in this manner is: (B). It reduces the time taken to reach the required floor, as the lifts can move faster.The most likely reason for this is: (A). Plants breathe very little during the winter months.Solution Q likely to do: (D). (Nothing can be said with just the given information.)Meaning of SolutionA solution can be defined as a chemical mixture that is formed by two major components which are known as the solute and the solvent.
A solution based on its components varies in its type and function.
In conclusion, The answers for the following questions are given above.
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What is the molality of a solution composed of 342 moles of sugar (C12H22O11) dissolved in 171 kilograms of water (H20)?
The molality of the solution which is composed of 342 moles of sugar were dissolved in 171 kilograms of water is 0.002 mol/g.
To calculate the molality of a solution, you need to divide the number of moles of solute by the mass of the solvent (in kilograms).
Given:
Number of moles of sugar (C₁₂H₂₂O₁₁) = 342 moles
Mass of water (H₂O) = 171 kilograms
Molality (m) = moles of solute/mass of solvent in kg
First, convert the mass of water from kilograms to grams:
Mass of water = 171 kilograms × 1000 grams/kilogram
= 171,000 grams
Now we can calculate the molality:
Molality = 342 moles / 171,000 grams
However, before we proceed, we consider the molecular weight of sugar (C₁₂H₂₂O₁₁) to convert from moles to grams.
The molecular weight of sugar can be calculated as follows:
12 carbon atoms × 12.01 g/mol = 144.12 g/mol
22 hydrogen atoms × 1.01 g/mol = 22.22 g/mol
11 oxygen atoms × 16.00 g/mol = 176.00 g/mol
Adding up the individual atomic masses
144.12 g/mol + 22.22 g/mol + 176.00 g/mol
= 342.34 g/mol
Now we calculate the molality:
Molality = 342 moles / 171,000 grams
= 0.002 mol/g
Therefore, the molality of the solution composed of 342 moles of sugar dissolved in 171 kilograms of water is 0.002 mol/g.
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A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules
of reactant at time t = 0, how many molecules remain unreacted after 100.0 minutes?
A) 1.00 x 10^4molecules
B) 2.00 x 10^19 molecules
C) 3.20 x 10^16 molecules
D) 5.00 x 10^20 molecules
E) none of the above
Answer:
E
Explanation:
100 minutes is 5 half lives ( 100 min/20 min/half life)
= (1/2 )^5
1 x 10^20 * (1/2)^5 = 3.125 x10^18 molecules
12. Explain the terms as used in potentiometric analysis (i) Accuracy (ii) Precision (iii) Sensitivity (iv) Selectivity 10marks
Precision refers to solute value, sensitivity is the ability to sense a change in solution, whereas accuracy and selectivity refer to the ability to detect the solute.
What is potentiometric titration?Potentiometric titration refers to a chemistry analytical strategy used to identify a particular substance, which may be a solute in the solution.
A potentiometric analysis is based on the use of electrodes capable of recording different values of the titrant substance, which enables the determination of the concentration of a given solute.
In conclusion, precision refers to solute value, sensitivity is the ability to sense a change in solution and accuracy and selectivity refer to the ability to detect the solute.
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How many hydrogen atoms are represented by (CH3)2CHOH?
Answer:
8 Hydrogen Atoms
Explanation:
The subscripts that are next to the coefficient (letter) indicates how much atoms the element/compound has.
So:
(CH3) × 2 ⇒ 6 hydrogen atoms
+ 1 from (CH) and another from (OH) ⇒ 8 atoms
Which of the following can contribute to food spoilage
Answer:
keeping things above 40 degrees Celsius as that can fasten the rot process of fruits and vegetables
Light, oxygen, heat, humidity, temperature and spoilage bacteria can contribute to food spoilage
What is food spoilageTiny living things called microorganisms like bacteria, molds, and yeasts can get into our food and make it go bad. They can become larger in size and increase in number, causing the food to feel different, look different, smell different, and taste different.
Enzymes in food can speed up spoilage. Enzymes can break apart the nutrients in food, which can cause the food to change and become less fresh.
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between Au3+ and Au+ which has a larger radius and why
Answer:
Au+ has larger radius than Au3+ Atomic no. of au is 79 , to become au3+ it has to loose 3 electrons and to become au+ it has to loose one electron if it loose 3 electrons the nucleus force will bound the other electrons strongly and the orbital radius will become small as compared to the parent atomgiven the reaction below, if 0.00345 g of carbon dioxide is used up, how many grams of water will be produced?
CO2 + 2LiOH → Li2CO3 + H2O
From the stoichiometry of the reaction, 1.4 * 10^-3 g is produced.
What mass of water is produced?The equation of the reaction is written as; CO2 + 2LiOH → Li2CO3 + H2O. This can help us to apply the principle of stoichiometry here.
Thus;
Number of moles of CO2 = 0.00345 g/44 g/mol = 7.8 * 10^-5 moles
If 1 mole of CO2 produced 1 mole of water
7.8 * 10^-5 moles of CO2 produced 7.8 * 10^-5 moles of water
Mass of water produced = 7.8 * 10^-5 moles * 18 g/mol = 1.4 * 10^-3 g
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If the diameter of an atom is 1x10^-8 cm, what is the diameter of the nucleus
If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.
What is the nucleus of an atom?The nucleus is the part of an atom that contains more than 99.9% of its mass, represented by protons and neutrons.
The diameter of an atom is 1 × 10⁻⁸ cm. The nucleus is about 10,000 times smaller than the atom. Thus, the diameter of the nucleus is:
d(nucleus) = d(atom) / 10,000
d(nucleus) = 1 × 10⁻⁸ cm / 10,000 = 1 × 10⁻¹² cm
If the diameter of an atom is 1 × 10⁻⁸ cm, the diameter of the nucleus is approximately 1 × 10⁻¹² cm, since the atom is mostly empty space.
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What mass of water is produced from the complete combustion of 4.60×10-3 g of methane?
Express your answer with the appropriate units.
Answer:
= 1.03 x 10⁻² g H₂O
Explanation:
To find the mass of water, you need to (1) convert grams CH₄ to moles CH₄ (via molar mass), then (2) convert moles CH₄ to moles H₂O (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles H₂O to grams H₂O (via molar mass). The final answer should have 3 sig figs to reflect the given value (4.60 x 10⁻³ g).
Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)
Molar Mass (CH₄): 16.043 g/mol
Combustion of Methane:
1 CH₄ + 2 O₂ ---> 2 H₂O + 1 CO₂
Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol
Molar Mass (H₂O): 18.014 g/mol
4.60 x 10⁻³ g CH₄ 1 mole 2 moles H₂O 18.014 g
-------------------------- x ----------------- x --------------------- x ---------------- =
16.043 g 1 mole CH₄ 1 mole
= 0.0103 g H₂O
= 1.03 x 10⁻² g H₂O
If charcoal and sugar were present in crude benzoic acid, would recrystallization from water be a good method of purification? Why? Explain.
Which of the following describes scientist?
Complete Question :
Which of the following describes scientists?
A. People with similar personalities
B. People from different backgrounds
C. People with perfect understanding of science
D. People with only one perspective
Answer :
Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct answer
What is Scientist ?
A scientist is a person who conducts scientific research to advance knowledge in an area of interest.
Scientists are motivated to work in several ways. Many have a desire to understand why the world is as we see it and how it came to be. They exhibit a strong curiosity about reality.
Therefore, Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct.
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Is it possible to use the subatomic particles as an energy source?
So first, let's get some background knowledge.
So, how does energy concentrate to become subatomic particles?
To answer it in the best way possible, we have to understand what is energy and what particles are.
The capacity to perform labor is energy. It cannot be made or taken away. All of it was made during the moment of the Big Bang. Since then, it has changed into one form or another or has been employed to produce particles. In their purest form, elementary particles are quantum fields that are waves in space-time carrying energy. These waves also contain four moments (energy, vector momentum, angular momentum, and charge), unless they are completely chargeless like photons. They are nothing more than energy, which is dependent on the wave's frequency (and has endowed with it some properties like charge and spin etc). Therefore, energy creates particles by destroying one or more particles and creating one or more other particles, by taking energy from them and transducing into the others, in a similar fashion to how particles came out of nothing but energy pumped into the space-time the first time (after the Big Bang). In quantum physics, the annihilation and creation operators are used to represent it. I'll use one as an illustration. formation of the duo. Once it collides with a heavy nucleus (i.e., one with a high atomic number, Z), a high-energy gamma ray with energy greater than the rest energies of a proton-electron pair experiences an electromagnetic interaction, which is mediated by a virtual photon, and generates an electron and positron pair. For instance, if the initial gamma ray had an energy of 20 MeV, the generation of the pair would take around 1.022 MeV (the total of the rest energies of the electron and positron), whereas the pair would share about 18.078 MeV in kinetic energy. As a result, the energy is simply converted from a boson with no charge, mass, or spin to two products with opposite charges, each having a mass of 0.511 MeV: a negatively charged spin 1/2 fermion and a positively charged spin 1/2 fermion (anti-particle of the first).
So to answer, let's complete this in a question, what subatomic particle causes electricity?
There are instances when the protons and electrons in an atom's outermost shells are not strongly attracted to one another. It is possible to force these electrons out of their orbits. They may move from one atom to another by exerting force. Electricity is made up of these moving electrons.
Given the equilibrium for a general reaction a+b c+d explain what happens to the reactants and products from time 0 until the time at which the reaction reaches equilibrium
The concentration of the reactants and products will balance out.
What is an equilibrium reaction?It is a characteristic of reversible reactions in which there will be no net change in the concentration of the reactants and that of the products.
In the reaction: a + b ---> c + d
At the beginning (time 0), a and b will react to produce c and d.
As soon as c and d are produced, 2 reactions go on simultaneously:
a and b reacting to produce more c and dc and d reacting to produce a and bThese reactions continue until as much c and are being produced as much as a and b.
In other words, equilibrium is reached when there is no net production of a and b as well as c and d.
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I need help with solution
[tex]molar \: mass = 48 \\ element = cadmium[/tex]
Answer:
A.) Titanium
Explanation:
The graph appears to be a mass spectrum. This graph describes the abundance of an element in a sample. The x-axis measures the mass of the element. As such, you can identify the element by determining which element has an atomic weight (g/mol) that matches the highest peak.
Titanium = 47.867 g/mol
Cadmium = 112.41 g/mol
Vanadium = 50.942 g/mol
The highest peak appears to be at 48. From these atomic weights, it seems that titanium is the element with the closest mass.
This graph is measuring an unknown element, so ideally, there would be only one peak. If this is a graph of one element, then why are their multiply smaller peaks? The smaller peaks are most likely isotopes or impurities.
Which describes the molecule shown below?
O A. Saturated alkane
B. Unsaturated alkyne
C. Saturated alkene
O D. Unsaturated alkene
Answer:
saturared alkane
because of its single bonded
When hydrogen sulfide gas is bubbled into a solution of sodium hydroxide, the reaction forms sodium sulfide and water. How many grams of sodium sulfide are formed if 1.50 g of hydrogen sulfide is bubbled into a solution containing 1.65 g of sodium hydroxide, assuming that the limiting reagent is completely consumed ?
Answer:
1.61 g Na₂S
Explanation:
To find the mass of sodium sulfide (Na₂S) generated from hydrogen sulfide (H₂S) and sodium hydroxide (NaOH), you need to (1) construct the balanced chemical equation, then (2) calculate the molar masses of each molecule involved, then (3) convert grams of each reagent to grams of the product (via the molar masses and mole-to-mole ratio from equation coefficients), and then (4) determine the limiting reagent and final answer. It is important to arrange the conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator).
(Step 1)
The unbalanced equation:
H₂S + NaOH ---> Na₂S + H₂O
Reactants: 3 hydrogen, 1 sulfur, 1 sodium, 1 oxygen
Products: 2 hydrogen, 1 sulfur, 2 sodium, 1 oxygen
The balanced equation:
H₂S + 2 NaOH ---> Na₂S + 2 H₂O
Reactants: 4 hydrogen, 1 sulfur, 2 sodium 2 oxygen
Products: 4 hydrogen, 1 sulfur, 2 sodium, 4 oxygen
(Step 2)
Molar Mass (H₂S): 2(1.008 g/mol) + 32.065 g/mol
Molar Mass (H₂S): 34.081 g/mol
Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.998 g/mol
Molar Mass (Na₂S): 2(22.990 g/mol) + 32.065 g/mol
Molar Mass (Na₂S): 78.045 g/mol
(Step 3)
1.50 g H₂S 1 mole 1 mole Na₂S 78.045 g
----------------- x ---------------- x -------------------- x ----------------- =
34.081 g 1 mole H₂S 1 mole
= 3.43 g Na₂S
1.65 g NaOH 1 mole 1 mole Na₂S 78.045 g
-------------------- x ---------------- x ----------------------- x ---------------- =
39.998 g 2 moles NaOH 1 mole
= 1.61 g Na₂S
(Step 4)
Because NaOH generates less product, it will run out before all of the H₂S is used. This makes NaOH the limiting reagent and the final answer 1.61 grams Na₂S.
Hidrocarburos alcanos ejemplos del 30 al 100
Explanation:
Metano: CH₄; Etano: C₂H₆; Propano: C₃H₈; Butano: C₄H₁₀; Pentano: C₅H₁₂; Hexano: C₆H₁₄; Heptano: C₇H₁₆; Octano: C₈H₁₈; Nonano: C₉H₂₀; Decano
3. Which of the following are oxidation reactions that might occur naturally in a forest? (select all that apply)
A. Erosion (from wind)
B. Erosion (from rain/water)
C. Decomposition (rotting)
D. Combustion (fire)
Answer:
D
Explanation:
it's a forest so erosion is out and rotting is not really a reaction
Answer:D
Explanation:
The explanation for the large space between particles in a gas is provided by ____. A. Boyle's law B. Dalton's law C. kinetic theory D. energy conservation
The explanation for the large space between particles in a gas is provided by the kinetic theory (option C).
What is the kinetic theory?The kinetic theory is a scientific theory used in physics to understand the behavior of gases.
This theory (kinetic theory) indicates that molecular distances in gases are small when compared to the molecular sizes.
In conclusion, the explanation for the large space between particles in a gas is provided by the kinetic theory (option C).
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What is the percentage by mass of nickel (Ni) in nickel phosphate (Ni3(PO4)2)? A. 64.9% B. 38.2% C. 48.1% D. 23.1%
The mass percentage of nickel in nickel phosphate is 48.1%.
Percentage by mass of nickel in nickel phosphate is 48.1%.
Here we have nickel phosphate - Ni₃(PO₄)₂
In this formula there are-
3 Ni atoms , 2 P atoms and 8 O atoms
now, the molecular mass nickel phosphate is- = 3 × molar mass of Ni + 2 × molar mass of P + 8 × molar mass of O
Now we know that -
molar mass of Ni = 58.7u
molar mass of P = 31u
molar mass of O = 16
So that here-
molecular mass of nickel phosphate = 3 × 58.7 + 2 × 31 + 8 × 16 = 176.1 + 62 + 128 = 366.1u
Now, mass of nickel in nickel phosphate = 3 × 58.7 = 176.1u
And for mass percentage - mass percentage = ( mass of nickel / mass of nickel phosphate ) × 100 = (176.1 / 366.1) × 100 = 48.10 %
Hence we can conclude that the mass percentage of nickel in nickel phosphate came out to be 48.1 % after applying all the concepts.
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In the following reaction, how much heat is
generated when 1.83 moles of CH4 are
burned?
CH4 (g) + 2 O2 (g) → CO₂ (g) + 2 H₂O(g) AH°
= -802 kJ/mol
Answer:
1470 kJ (to 3 sf)
Explanation:
(802)(1.83) = 1470 kJ (to 3 sf)
If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy __________ L at STP.
If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.
How to calculate volume?The volume of a gas at STP can be calculated using the direct proportion method.
According to this question, 50.75 g of a gas occupies 10.0 L at STP, then 129.3g of the same gas will occupy the following:
= 129.3 × 10/50.75
= 25.48L
Therefore, if 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.
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It has been proposed that North America is moving west at about 2 cm per year. How many kilometers would it move in 5,000 years? (Note: 2 cm is a measurement so your final answer should have significant figure rules applied.) km
Answer:
0.1 kilometer
Explanation:
First, multiply 5,000 by two to get your cm after 5,000 years which is 10,000 cm and then divide by 100,000 to convert to kilometers which is 0.1.
An obsolete scientific theory is a scientific theory that, though once widely accepted, has since been discarded. For example, the Flat Earth theory, which states that the Earth's shape is flat, like that of a paper, is an obsolete scientific theory. This is because it was later proven that the Earth's shape is not flat, but almost spherical.
Which of the following is another obsolete scientific theory?
Another example of an obsolete scientific theory is Lamarck theory that was challenged by Darwinian evolution.
What is an obsolete scientific theory?An obsolete or superseded scientific theory is a scientific theory that, though once widely accepted, has since been discarded or superseded.
According to this question, one example of obsolete scientific theory is Flat Earth theory, which states that the Earth's shape is flat, like that of a paper.
Another example of an obsolete scientific theory is Lamarck theory that was challenged by Darwinian evolution.
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A substance is considered more efficient at storing energy when its specific heat enables it to resist changes in temperature. so, a more efficient substance will stay hotter, or cooler, for longer. based on your answers for questions 1 through 3, which substance—air or water—stores energy more efficiently under equal conditions?
Water stores energy more efficiently than air under equal conditions.
It requires more energy to heat water than it does to heat air because water has a significantly larger heat capacity and specific heat than air. Compared to air, which has a specific heat of 1.005 J/g degreesC, water has a specific heat of 4.186 J/g degreesC.
Specific heat:
The amount of heat required to raise the temperature per unit mass is known as specific heat capacity. The heat in Joules required to increase the temperature of 1 gram of sample by 1 Kelvin or degree Celsius is often stated. Water is an excellent temperature regulator since it has a very high specific heat capacity.
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Suppose that 25g of each substance is initially at 27.0grade centígrados what is the final temperatura of each substance upon absorbing 2.3 kJ of heat
The temperature rise of each substance depends on its specific heat capacity.
What determine the rise in temperature of equal masses of substances when heated?The rise in temperature in a substance depends on the specific heat capacity of the substance.
The formula to determine the temperature rise is give as:
Q = mcΔT
Where:
Q = quantity of heatm = massc = specific heat capacityΔT = temperature riseSubstances with large heat capacities have the lowest temperature rises while those with small heat capacities have the biggest temperature increase.
In conclusion, the temperature rises depends on the specific heat capacity.
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I would appreciate if somebody help me please!!! Pt2 posted
The disease prevention methods are as follows:
Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your handsSalmonella: wash hands properly; keep food area clean; cook food properlyType 2 Diabetes : exercise regularly; reduce sugar intake; quit smokingHIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusionHeart disease: avoid trans fat; exercise regularly; avoid smokingWhooping cough: wear face masks; wash regularly; get vaccinatedWhat is the disease prevention?Disease prevention refers to the steps taken to protect oneself from developing a particular disease.
The disease prevention methods for the given diseases is as follows:
Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your handsSalmonella: wash hands properly; keep food area clean; cook food properlyType 2 Diabetes : exercise regularly; reduce sugar intake; quit smokingHIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusionHeart disease: avoid trans fat; exercise regularly; avoid smokingWhooping cough: wear face masks; wash regularly; get vaccinatedIn conclusion, disease prevention is the best policy in health care.
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What is the number of oxygen atoms in a formula unit of Al2(SO4)3?
No of molecules of Aluminium trisulphate
6.023×10²³No of moles of each
Al=2S=3O=12Total=17
So no of oxygen atoms
(6.023×10²³/17)×124.25×10²³atomsThere are 12 oxygen atoms in a formula unit of [tex]\rm Al_2(SO_4)3[/tex].
In the formula unit of [tex]\rm Al_2(SO_4)3[/tex], there are a total of 12 oxygen atoms. To determine the number of oxygen atoms, we break down the formula into its constituent elements.
[tex]\rm Al_2(SO_4)3[/tex] consists of 2 aluminum (Al) atoms, 3 sulfate ([tex]\rm SO_4[/tex]) ions, and each sulfate ion contains 4 oxygen (O) atoms.
Therefore, the number of oxygen atoms is calculated as follows:
Number of oxygen atoms = 2 (Aluminum atoms) + 3 (Sulfate ions) x 4 (oxygen atoms per sulfate ion)
Number of oxygen atoms = 2 + 12 = 14
Thus, there are 12 oxygen atoms in a formula unit of [tex]\rm Al_2(SO_4)3[/tex].
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