What is the molar mass of KNO3?
Answer:
K=39, N=14, O=16. So molar mass of KNO3= 39+14+3(16)= 101
Im Wrong?
Which of the following empirical formulas is written correctly? *
plss help . i have no idea
Answer:
Protons and Neutrons have approximately the same mass.
Equal numbers of protons and electrons make an atom neutral.
Protons have a positive charge
Explanation:
Protons and Neutrons have approximately the same mass. - both are 1 amu
Equal numbers of protons and electrons make an atom neutral. - protons are +1 and electrons are -1, so they cancel each other if there are equal amounts.
Protons have a positive charge - this is true.
A sample of oxygen gas has a volume of 150 mL when its pressure is 0.587 atm at 155 K. If the pressure and temperature are increased to STP, what will the new gas volume be?
Answer:
V₂ = 155.17 mL
Explanation:
Given data:
Initial volume = 150 mL
Initial pressure = 0.587 atm
Initial temperature = 155 K
Final temperature = 273.15 K
Final volume = ?
Final pressure = 1 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 0.587 atm × 150 mL × 273.15 K / 155 K × 1 atm
V₂ = 24050.86 atm .mL. K / 155 K.atm
V₂ = 155.17 mL
How to calculate the number of molecules in 18g of H2O
We, know molecular mass of water is, M = 16 g/mol .
Given mass of water, m = 18 g.
We know, number of moles is given by :
[tex]n = \dfrac{18\ g}{16 \ g/mol}\\\\n = 1.125\ moles[/tex]
Now, 1 mole of any compound contains 6.022 × 10²³ molecules.
So, number of moles in 1.125 moles of water is 1.125 × 6.022 × 10²³ =
6.77 × 10²³ molecules.
Hence, this is the required solution.
HELP PLEASE!!!!!!
“Andy was drawing
of his circuit. When
asked to explain it,
he said, “This is an
example of a
perpendicular
circuit. The light on
the left will be
brighter because
there is less wire."
Is he correct?”
Which statement below is TRUE about COMPOUNDS? *
a) Compounds are made up of the same type of atoms.
b) Compounds are made up of only 1 atom.
d) Compounds are made up of different atoms stuck together.
d) Compounds can only contain 2 atoms.
what is a good way to define lunar
Which of the following reactions is irreversible?
A. Zinc (Zn) reacting with hydrochloric acid (HCl)
B. Haber Process
C. Dehydrating copper sulfate (CuSO4)
D. Thermal decomposition of NH4Cl
PLEASE HELP
Answer:
A. Zinc (Zn) reacting with hydrochloric acid (HCl)
Explanation:
The reaction of Zinc with hydrochloric acid is an irreversible chemical process.
What makes a reaction reversible;
it must be involved in reversible chemical processes, no matter how small the extent of the reversibility. the rate of forward reaction must be equal to the backward one.So, hydrochloric acid when reacting with Zinc will give a complete chemical change that will go into completion.
Answer:
(A): Zinc (Zn) reacting with hydrochloric acid (HCI)
Explanation:
I got it right on founders edtell
Which statement best describes the relationship between photosynthesis and cellular respiration?
Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.
Photosynthesis is part of the carbon cycle, and cellular respiration is not.
Only plants perform photosynthesis, and only animals perform cellular respiration.
Photosynthesis releases carbon into the atmosphere, and cellular respiration removes carbon from the atmosphere.
Answer:
Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.
Explanation:
The first option clearly expresses the relationship between photosynthesis and cellular respiration.
Cellular respiration releases carbon back into the atmosphere whereas photosynthesis removes the carbon from the atmosphere.
Photosynthesis is the process whereby green plants manufacture their food using carbon dioxide and water.
In cellular respiration, the product of the photosynthesis is used by organisms to produce energy.
I don’t know this and I need help help me
GIVING BRAINLIST TO BEST ANSWER! How does Bohr’s model of the atom compare with Thomson’s model?
A) They both describe atoms as small, indivisible spheres.
B) They both describe electrons as moving around the nucleus.
D) They both describe electrons as being surrounded by the positive matter.
C) They both describe atoms as being made up of positive and negative matter.
Answer:I say C .. u should give the other person Brainliest bc they had a fully answer!
Explanation:
Answer:
d on brainly
Explanation:
i just took the exam
How is agriculture depended on industries
Answer:
The interdependence of agriculture and industry helps the development of both the sectors. The most important aspect of this inter dependence is that the products of one serve as important inputs for the other. Growth of one sector, thus means ample supply of inputs for the other.
Explanation:
DENSITY CHEMISTRY WORD PROB I WILL MARK BRAINLIEST PLEASE HELP I NEED ASAP
Answer:
The number of passengers that the Embraer E170 could carry if its fuselage was made of steel is 39 passengers
Explanation:
The given parameters of the cylinder representing the fuselage are;
The length of the cylinder, l = 30.0 meters
The width of the cylinder, w = 2.5 meters
The thickness of the cylinder, t = 2.5 mm = 0.0025 meters
The volume of the metal required to make the fuselage cylinder, V = (π·w²/4 - π·(w - 2·t)²/4) × l
Therefore, by substituting the known values, we have;
V = (π × 2.5²/4 - π×(2.5 - 2×0.0025)²/4) × 30 = 0.58845957392
The volume of the metal required to make the fuselage cylinder, V≈ 0.58846m³
The given density of steel = 7.87 g/cm³ = 7870 kg/m³
The given density of aluminum = 2.70 g/cm³ = 2,700 kg/m³
Mass = Density × Volume
The mass of the fuselage made with steel = The given density of steel × The volume of the metal required to make the fuselage cylinder
∴ The mass of the fuselage made with steel = 7870 × 0.58846 ≈ 4631.18
The mass of the fuselage made with steel ≈ 4631.18 kg
Similarly, the mass of the fuselage made with aluminum = 2,700 × 0.58846 ≈ 1588.84
The mass of the fuselage made with aluminum ≈ 1588.84 kg
The total mass the Embraer E170 could carry = The mass of the fuselage made with aluminum + The mass of the 78 passengers
The average mass of each passenger = 79 kg
∴ The total mass the Embraer E170 could carry ≈ 1588.84 + 78 × 79 = 7750.84
The total mass the Embraer E170 could carry ≈ 7750.84 kg
The extra mass the Embraer E170 could carry when made of steel = (The total mass the Embraer E170 can carry) - (The mass of the fuselage made with steel)
∴ The extra mass the Embraer E170 could carry when made of steel = 7750.84 - 4631.18 = 3119.36
The extra mass the Embraer E170 could carry when made of steel ≈ 3119.36 kg
The number of passengers the Embraer E170 could carry when made of steel = (The extra mass the Embraer E170 could carry when made of steel)/(The average mass of one passenger)
∴ The number of passengers the Embraer E170 could carry if its fuselage was made of steel = 3119.36 kg/(79 kg/passenger) ≈ 39.489 passengers
The number of passengers that the Embraer E170 could carry if its fuselage was made of steel ≈ 39 passengers (we round down when counting people which are whole quantities)
Please pls help ASAP
Answer:
??
Explanation:
I can't tell, you don't have the answer choices up I can't see them
what are the in the drop-down boxes?
What is the molality of a solution made by dissolving 2 moles of NaOH in 6 kg
of water?
A. 0.33 mol/kg
B. 12 mol/kg
C. 3 mol/kg
D. 2 mol/kg
The molality of a solution : m = 0.33 mol/kg
Further explanationGiven
2 moles of NaOH in 6 kg of water
Required
The molality
Solution
Molality shows how many moles are dissolved in every 1000 grams of solvent.
m = n x (1000/p)
m = Molality
n = number of moles of solute
p = solvent mass (grams)
Input the value :
solute : NaOH
solvent : water
m = 2 moles : 6 kg
m = 0.33 mol/kg
If I have one mole of sulfur, how many grams would it weigh?
Answer:
32.06 grams
Explanation:
One mole of sulfur is equal to 32.06 grams of sulfur.
Answer:ok
Explanatio
heres the answer 32.065 grams because 1 mole is equal to 1 moles Sulfur
The citizens of a town are aware of climate change, and they want to make changes to control it. One change they consider is replacing the nearby thermal power plant with a hydroelectric plant. If they want to make sure this change will help to slow climate change, which question should they ask?
Answer: How hydroelectric plant is better over thermal power plant in creating less pollution?
Explanation:
The thermal power plant utilizes the coal as a fuel. The heat energy so produce after burning coal is used for generating electrical energy. The burning of the coal results in the production of pollutants. The carbon dioxide is also a chief pollutant of coal burning. This can pollute the air.
The hydroelectric plant is better than thermal power plant in the sense no fuel is required for this purpose the energy from water currents are used for generating electrical energy.
So, the citizens should research about hydroelectric plant and try to know how it is efficient in providing routine energy supply and impact it exerts on the environment if used as a source of energy generation.
Calculate the pH of the following?
a) 0.12 M NaNO2
b) 0.10 M CH3NH3Cl
c) .45 M NaOCl?
explain why you need both muscles and bones to move your body.
Answer:
i dont need
Explanation:
do u know ......
Please help me!!! 12 points :)
A very loud sound has a high _____.
resting point
amplitude
wavelength
bass
Answer:
Resting Point
Explanation:
Answer: amplitude
Explanation:
A. Neutrons and electrons
B. Protons and electrons
C. Electrons in energy levels
D. Protons and neutrons
Answer:
D.
Explanation:
Because protons and neutrons make up the mass of an atom.
how molecules react to an increase in temperature.
Answer:
An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).
Explanation:
What are the three eras in the geologic time scale? *
guys please finnish thiissss
Answer:
1. H2O
2. Ba(OH)2
3. H2O
4. H2O
5. Ca(OH)2
6. H2O
Explanation:
Answer:
1. H2O
2. Ba(OH)2
3. H2O
4. H2O
5. Ca(OH)2
6. H2O
Explanation:
Hope this helps
What will be the mass of 9.95 liters of propane gas (C3H8) at STP?
Answer:
19.5g
Explanation:
Given parameters:
Volume of propane gas = 9.95L
Unknown:
Mass of propane gas = ?
Solution:
To solve this problem, find the number of moles first.
At STP;
22.4L of gas makes up 1 mole
9.95L of gas will have a [tex]\frac{9.95}{22.4}[/tex] = 0.44mole
So;
Mass of propane gas = number of moles x molar mass
Molar mass of propane = 3(12) + 8(1) = 44g/mol
Mass = 0.44 x 44 = 19.5g
PLS HELP!!!!! WILL GIVE BRAINLIEST, 5 STARS, AND THANKS!!!!!!!!!!
Which reactions are the reverse of one another?
condensation and addition
addition and elimination
elimination and condensation
substitution and addition
Answer:
it has to be b
Explanation:
the other ones don't make any sense
In an experiment, potassium chlorate decomposed according to the following chemical equation.
2 KClO3 → 2 KCl + 3 O2
If the mass of potassium chlorate was 240 grams, what is the mass of oxygen gas formed?
Answer Choices:
A)
94.03g
B)
1378g
C)
41.8g
D)
612.5g
A heavily wooded area needs additional solar collectors to meet energy demand. Which statement describes a possible environmental consequence of adding these collectors?
A.
The amount of air pollution will increase.
B.
The amount of water pollution will increase.
C.
More trees will need to be planted to insulate the solar collectors.
D.
Trees will need to be cleared for the solar collectors to work efficiently.
Answer:
C
I think not positive good luck tho
A heavily forested area is one that has a dense and large number of trees. The areas like mountainous tracks or the protected frosts areas of wildlife.
In order to have solar collectors that meet the demands of energy generation. Some parts of the forests may have to clear off. As for collecting the sunlight, there needs to be clear ground. As trees and forests absorb insolation.Hence the option D is correct, trees need to to be cleared for working efficiently.
Learn more about the area that needs additional solar collectors to meet energy demand.
brainly.in/question/40583530.