2. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest
.01 ) : Show all work!
Isotope: Mg Percent abundance: 78.70%
24
Isotope: 'Mg Percent abundance: 10.13% 25
Isotope: Mg Percent abundance: 11.17% 26

2. Using The Following Data, Calculate The Average Atomic Mass Of Magnesium (give Your Answer To The

Answers

Answer 1

Answer: 24.309amu

Explanation:


Related Questions

II. Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 3.86 g of magnesium ribbon burns with 155ml of oxygen at 1.0 atm and 275 K , a bright, white light and a white, powdery product is formed, magnesium oxide. How many grams of excess reactant remain?

Answers

Answer:

[tex]Excess=3.53g[/tex]

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

[tex]2Mg(s)+O_2(g) \rightarrow 2MgO(s)[/tex]

Next, we identify the limiting reactant by computing the moles of magnesium oxide yielded by 3.86 g of magnesium and 155 mL of oxygen at the given conditions via their 2:1:2 mole ratios and the ideal gas equation:

[tex]n_{MnO}^{by \ Mg}=3.86gMg*\frac{1molMg}{24.3gMg}*\frac{2molMgO}{2molMg} =0.159molMgO\\\\n_{MnO}^{by \ O_2}=\frac{1atm*0.155L}{0.082\frac{atm*L}{molO_2*K}*275K} *\frac{2mol MgO}{1molO_2} =0.0137molMgO[/tex]

It means that the limiting reactant is the oxygen as it yields the smallest amount of magnesium oxide. Next, we compute the mass of magnesium consumed the oxygen only:

[tex]m_{Mg}^{consumed}=0.0137molMgO*\frac{2molMg}{2molMgO} *\frac{24.3gMg}{1molMg} =0.334gMg[/tex]

Thus, the mass in excess is:

[tex]Excess=3.86g-0.334g\\\\Excess=3.53g[/tex]

Regards!

please help me :( What is the correct ratio of carbon to hydrogen to oxygen in glucose (C6H120.)?
12:12:6
01:2:1
02:1:1
6:6:12

Answers

Answer:

Either 12:12:6 or 6:6:12

Explanation:

If I remember correctly the answer should be 6:6:12


Calculate the density of an
object with a mass of 58g and a
volume of 20 mL.
Enter

Answers

Answer:

D = 2.9 g/mL

Explanation:

Density = Mass over Volume

D = m/V

Step 1: Define

m = 58 g

V = 20 mL

D = unknown

Step 2: Substitute and Evaluate for Density

D = 58 g/20 mL

D = 2.9 g/mL

How many protons and electrons does a hydrogen atom have?

Answers

A hydrogen atom contains 1 electron, 1 proton

Explanation:

Question 20 of 66
Which of the following species has the same number of protons as Fe3+?
A) Mn3+
B) Co2+
C) Fe2+
D) Nit
E) CO3+

Answers

Okay, so you know that the number of protons never changes for a certain element. It defines what the element is, so as the element in the question is iron (fe) we know that the answer must also be iron. Therefore the answer is C. The 2+ and 3+ do not matter as these show that there are different numbers of electrons.
If you have any questions please let me know.

Fe²⁺ has the same number of protons as Fe³⁺.

In order to know the number of protons of a species, we need to look for the atomic number (Z) in the Periodic Table.

The atomic number of Fe is 26, so it has 26 protons. Since protons are in the nucleus, they are not lost nor gained. Fe³⁺ results from Fe losing 3 electrons, but it has 26 protons as well.

Taking this into account, let's consider the number of protons of the following species:

A) Mn³⁺. It has 25 protons like Mn (Z = 25).

B) Co²⁺. It has 27 protons like Co (Z = 27).

C) Fe²⁺. It has 26 protons like Fe (Z = 26).

D) Ni. It has 28 protons (Z = 28).

E) Co³⁺. It has 27 protons like Co (Z = 27).

Fe²⁺ has the same number of protons as Fe³⁺.

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Fill in the blank... spelling counts.

Speed is the ______ something travels divided by the _____ It takes to travel that dinstance.

Answers

Answer:

[tex]speed = \frac{distance}{time}[/tex]

In Natural selection, individuals whose unique characteristics are well-suited for an environment tend to survive and produce more offspring. true or false? i need this help!right now!

Answers

Answer:

True

Explanation:

True. If an animal has attributes to it that help it survive better in an environment, it will survive better than its counterparts who do not have this attribute. More survival = More offspring

Answer:

True.

Explanation:

It's called survival of the fittest. Animals are genetically supposed to be well suited to their environment and if they aren't, they die out.

Scientists utilize models for a variety of different purposes, but each type of scientific model has limitations. What might
be a limitation of existing solar system models?
a. They are not based on experimentation.
b. They are used for prediction.
C. They cannot be changed.
d. They are based on current knowledge,
Please select the best answer from the choices provided
А
B
С
D

Answers

C. They cannot be changed.

I saw this on quizlet, hope this helps!

Answer:

D.They are based on current knowledge.

Explanation:

Guy above me is wrong

Which would most likely be the pH of a highly-corrosive acid? 1 5 8 11

Answers

Answer:

it is 1 because of it is below 7 then it will be dangerous for humans

The pH of the highly corrosive acid, given the data from the question is 1

What is pH ?

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

pH scale

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

0 to 6 indicates acid 7 indicates neutral 8 to 14 indicate basic

NOTE: The lesser the pH of a substance, the more acidic (corrosive) it is and the greater the pH of the substance, the less acidic (corrosive) it is.

With the above information about pH, we can conclude that the pH of the highly corrosive acid, given the data is 1

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Consider the reaction when aqueous solutions of calcium nitrate and potassium carbonate are combined. The net ionic equation for this reaction is:

Answers

Answer:

Ca2+(aq)   +  2OH-(aq)  →  Ca(OH) 2 ( s )

Explanation:

The balanced equation is given as;

Ca(NO 3 ) 2 ( aq )  +  2KOH(aq)  →  Ca(OH) 2 ( s )  +  2KNO 3 ( aq )

The net ionic equation features only ions that actually participated in the reaction. These ions are identified due to their change in oxidation numbers. Also, the aqueous compounds are broken down into ions.

Ca2+  + 2NO3-  +  2K+  +  2OH-  →  Ca(OH) 2 ( s ) +  2K+   +  2NO3-

Ions present in both sides of the equation above. These are; NO3-,  K+ and OH-

The net ionic equation is;

Ca2+(aq)   +  2OH-(aq)  →  Ca(OH) 2 ( s )

20 POINTS A group of students is conducting a density experiment with two blocks. Block 1 has more mass and less volume than Block 2. Based on this information, the student can correctly conclude that *


both blocks have densities less than water's density

both blocks have densities greater than water's density

Block 1 has a higher density than Block 2

Block 1 has a lower density than Block 2

Answers

Answer:

Block 1 has a higher density then block 2

Explanation:

Answer:

Yep, the correct answer is C. Block 1 has a higher density than block 2.

Explanation:

100 POINTS!!!!

The passage states that water exists in three states on Earth. Trace the changes in state of matter, from snow-capped mountain, through the water cycle, and finally back to the snow-capped mountain.

A) melting snow; lliquid runoff; liquid water evaporates; water freezes; precipitation of frozen water (snow) back to Earth

B) solid snow melts; liquid water flows to oceans; water evaporates; water condenses to form clouds; snow falls back to Earth

C) solid snow melts; liquid water evaporates; gaseous water vapor condenses; water freezes; precipitation of frozen water (snow) back to Earth

D) solid snow melts; liquid water soaks into ground; plants take up water; water evaporates; water freezes; precipitation of frozen water (snow) back to Earth


YOU CAN HAVE ALL MY POINTS AND THE BRAINLIEST PLS HELP ME!!!!

Answers

Answer:

C

Explanation:

solid snow melts; liquid water evaporates; gaseous water vapor condenses; water freezes; precipitation of frozen water (snow) back to Earth

only cycle that makes sense

Answer:

The answer is C

Explanation:

can someone help me im doing chemistry right now and I have a question which I have no idea how to solve and I need to show work it it needs to be shown in scientific notation

(7.6x10^-1)+(2.0x10^-2)

Answers

The answer should be 0.78

Question 1 of 10 What is molarity a measurement of? O A. The volume of liquid containing a dissolved substance B. The grams of a substance dissolved in a liquid O c. The concentration of a substance dissolved in a liquid O D. The number of moles of a dissolved substance

Answers

To do this measure called molarity is commonly used. Molarity (M) is defined as the number of moles of solute (n) divided by the volume (V) of the solution in liters. It is important to note that the molarity is defined as moles of solute per liter of solution, not moles of solute per liter of solvent.                    

so the answer is D.

hope this helps have a great day....!

According to the concept of molar concentration, molarity is  defined as the number of moles of a dissolved substance.

What is molar concentration?

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

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group of students is investigating whether the force of friction depends on the nature of the surfaces in contact. The students push two pieces of wood each with the same force on a table. One piece of wood is smooth and the other is rough. The distance traveled by each piece of wood is shown.

Experimental Observations
Student 1 Student 2 Student 3 Student 4
Distance traveled by smooth piece of wood 20 cm 18 cm 16 cm 19 cm
Distance traveled by rough piece of wood 15 cm 12 cm 10 cm 11 cm
What was the outcome variable (dependent variable) in this experiment?

Group of answer choices

Distance traveled

Smooth wood

Rough wood

Number of students

Answers

Answer:

Distance traveled.

Answer: distance traveled

Explanation: I just got the answer right.

A sample of a metal has a mass of 23.4 g and a volume of 3.0 mL. What is the sample’s most likely identity?
A. Aluminum (2.8 g/mL)
B. Iron (7.8 g/mL)
C. Copper (8.9 g/mL)
D. Gold (19.3 g/mL)

Answers

Answer:

B. Iron (7.8 g/mL)

Explanation:

23.4/3 = 7.8

7.8g/mL

The identity of a sample of a metal that has a mass of 23.4 g and a volume of 3.0 mL is iron with a density of 7.8g/mL.

How to calculate density?

The density of a substance can be calculated by dividing the mass of the substance by its volume. That is;

Density = mass (g) ÷ volume (mL)

According to this question, a sample of a metal has a mass of 23.4 g and a volume of 3.0 mL. The density of the metal is as follows:

Density = 23.4g ÷ 3mL

Density = 7.8g/mL

Therefore, the identity of a sample of a metal that has a mass of 23.4 g and a volume of 3.0 mL is iron with a density of 7.8g/mL.

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The chemical formula for calcium chloride is

Answers

Answer: anhydrous CaCl 2 :0H 2 O

monohydrate CaCl 2 :1H 2 O

a di-hydrate CaCl 2 :2H 2 O

Explanation:

Order: Vitamin K (Aquamephyton) 1 mg IM x 1 dose Newborn: Weight 4 kg Supply: 10mg/mL vial How many mLs would be given

Answers

Answer:

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

Explanation:      

Given:

Desired dose (D)= 1 mg

Dose in hand (H) = 10 mg

Quantity (Q) = 1 ml

Computation:

Volume(ml) of drug = [Desired medicine / medicine in hand] Quantity.

Volume(ml) of drug required = [1/10]1

Volume(ml) of drug required = 0.1 ml

So, medicine is safe for this child.

in addition to Earthquake, hurricane, which of the following could be categorized as a "disaster" risk?

Answers

Answer:

I think its a World War.

Explanation:

This is just what my sister told me, since the cost for the war could make a country poor and the damage it could cause could lead a country to disaster.

i think d answer is tsunami

Why is H2S called an analytical agent?​

Answers

Answer:

Hydrogen sulfide is an newly recognized signical molecule with very potent cytoprotective actions.

A deck of cards has dimensions 8.9cm x 5.72cm x 1.82 cm. What is the volume of the deck in cubic centimeters?

Answers

Answer:

92.65256 cm^3

Explanation:

To find this, we can simply multiply all three dimensions to get the answer in cubic centimeters, and we get the answer above. If you want to be more specific, we can go by the sigfig rule and the answer would be rounded to 93 cm^3.

how much valence electrons does aluminum have​

Answers

He has 300 thank me

Answer:

3

Explanation:

It is in the third column or group on the periodic table

Photons are emitted as electrons in the atom jump up in energy. true or false?

Answers

Answer:

true

Explanation:

photons are emitted when electrons move from from a lower energy level to a higher energy level

How do I find the hydrated formula?

Answers

Answer:

In order to determine the formula of the hydrate, [Anhydrous Solid⋅xH2O], the number of moles of water per mole of anhydrous solid (x) will be calculated by dividing the number of moles of water by the number of moles of the anhydrous solid (Equation

Explanation:

The vaporization of Br2 from the liquid to the gas state requires 7.4 kcal/mol. write a reaction showing heat as a product or reactant

Answers

Answer:

Br₂(l) + ΔV → Br₂(g)

Explanation:

When a chemical or phase change occurs during a chemical process some heat is absorbed or released. For the process of vaporization of a substance, the heat (Usually required) is ΔV (How many energy is required for the process occurs).

In the vaporization of Br2 there are required 7.4kcal/mol, Δv. The reaction is:

Br₂(l) + ΔV → Br₂(g)

1) The speed constant was determined for the first order decomposition of an organic compound at various temperatures:
Calculate the activation energy for the reaction. Build a graph of Arhenius

2) The hydrolysis of sucrose. in which a sucrose molecule is broken in a glucose molecule and a fructose molecule, is part of the digestive process. Calculate the speed constant for the hydrolysis of sucrose at 35,0 C knowing that k=1,0x10^-3 L mol^-1s^-1 at 37 C and that the activation energy is 108kj mol^-1

Answers

Answer:

1) Eₐ = 100.3 kJ/mol

2) k = 7.62×10⁻⁴ M⁻¹s⁻¹

Explanation:

1) Make an Arrhenius graph by plotting ln(k) on the y-axis and 1/T on the x-axis (don't forget to convert temperature to Kelvin).

The slope of the line is equal to -Eₐ/R.

-Eₐ/R = -12065

Eₐ = 100,300 J/mol

Eₐ = 100.3 kJ/mol

2) Since we know the slope of ln(k) vs 1/T is -Eₐ/R, we can say:

-Eₐ/R = (ln(k₂) − ln(k₁)) / (1/T₂ − 1/T₁)

Plug in values and solve for k:

-(108,000 J/mol) / (8.314 J/mol/K) = [ln(k) − ln(1.0×10⁻³)] / [1/(35+273.15 K) − 1/(37+273.15 K)]

-12990 = [ln(k) + 6.91] / (2.09×10⁻⁵ K⁻¹)

-0.272 = ln(k) + 6.91

ln(k) = -7.18

k = 7.62×10⁻⁴ M⁻¹s⁻¹

Meaning of biocentric

Answers

can i please get brainlyest

"the view or belief that the rights and needs of humans are not more important than those of other living things."

Answer:

the view or belief that the rights and needs of humans are not more important than those of other living things.

explanation:

An antacid tablet contains 640.0 mg of magnesium oxide per tablet.
What volume of 0.1000 M stomach acid (HCI) could one tablet neutralize?​

Answers

Answer:

317.6 mL

Explanation:

Step 1: Write the balanced neutralization equation

MgO + 2 HCl ⇒ MgCl₂ + H₂O

Step 2: Calculate the mass corresponding to 640.0 mg of MgO

The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:

0.6400 g × (1 mol/40.30 g) = 0.01588 mol

Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO

The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol

Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles

0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL


1. As an electron in an atom moves from a higher energy state to a lower energy state, the atom
(A) becomes a negative ion
(C) releases energy
(B) becomes a positive ion
(D) absorbs energy

Answers

Answer:

(C) releases energy

Explanation:

From Bohr's model of the atom, we can understand the energy transitions involved when an electron moves from one energy level to another.

An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is emitted.

(C) releases energy

From Bohr's model of the atom:

We can understand the energy transitions involved when an electron moves from one energy level to another.

An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is released or emitted.

Therefore, option C is correct.

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How do elements tend to structure the molecules of life?

Answers

Answer:

The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Atoms of these elements combine and form thousands of large molecules. These large molecules make up the structures of cells and carry out many processes essential to life.

Explanation:

hope that helped

Different elements combine together to form an organism and other essential organic and inorganic molecules for the life and survival of organisms.

In multicellular organisms, such as animals, atoms form molecules by coming together. These atoms are present in the elements. Molecules can interact to form cells. Cells combine to form tissues, which make up organs.

At the most basic level, all organisms are made of a combination of elements:

carbon is the most common and essential element for the lifeCarbon has the ability to form a wide range of compounds.With other elements most commonly, hydrogen, the oxygen they form various molecules such as carbohydrates, lipids, and many more.With other molecules like phosphate, sulfur, and nitrogen they make essential macromolecules and nutrients like protein, vitamin, and nucleic acid essential for life.

Thus, Different elements combine together to form an organism and other essential organic and inorganic molecules for the life and survival of organisms.

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