Moles to Grams and Grams to Moles

How many grams of NH₃ would result in 8 moles of NH_3. What does the the number 8 do to the molar mass of the compound?

• The number 8 is added to the molar mass to give 25 g/mol.

• The number 8 multiplies the molar mass by 8 to give 136 g/mol.

• The number 8 divides the molar mass by 8 to give 2.13 g/mol.

• The number 8 does not change the molar mass of the compound.

Calculate the number of atoms in 0.0340 g Zn.

• 5.200 x 10^-4 atoms Zn

• 3.130 x 10²³ atoms Zn

• 3.130 x 10²⁰ atoms Zn

• 1 atom Zn

Tags

NGSS.HS-PS1-7

A student calculated the number of moles of methane (CH4) present in a 100g sample of a gaseous mixture. If the student determined that there’s 0.6 moles of methane present in the sample, what is the percent composition of methane in the sample?

• .096%

• 9.6%

• .9%

• 90%

To transform from grams of one substance to grams of another, what are the steps you take?

• Grams A --> Moles A--> Grams B --> Moles B

• Grams A --> Moles B --> Grams B

• Grams A --> Grams B

• Grams A --> Moles A --> Moles B --> Grams B

When you start with grams of a substance, the next conversion factor will be....

• Molar Mass A

  1 mole A

• Molar Mass A

  Given Mass A

• 1 Mole A

  Molar Mass A

• 1 mole A

  1 mole B

Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine:

• the energy released in the reaction.

• the speed of the reaction.

• whether the reaction is reversible.

• the mass of the product produced from a known mass of reactant.

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation N_2+3H_{2 ightarrow ext{2NH}_3}, how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?

• 0.9 mol

• 18 grams

• 0.53 mol

• 36 grams

Tags

NGSS.HS-PS1-7

How many grams of water (H2O) are present in 2 moles of water?

• 18 grams

• 36 grams

• 54 grams

• 72 grams

Tags

NGSS.HS-PS1-7

If you have 44 grams of carbon dioxide (CO2), how many moles do you have?

• 1 mole

• 2 moles

• 0.5 moles

• 4 moles

What is the molar mass of sodium chloride (NaCl) if you have 58.5 grams of it?

• 58.5 g/mol

• 29.25 g/mol

• 117 g/mol

• 14.625 g/mol