Stoichiometry Mole to Mass

How many moles of S₈ is needed to produce 12 moles of SO₃?

• 1

• 1.5

• 2

• 12

Tags

NGSS.HS-PS1-7

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

What is the mole ratio of H2O to H3PO4 in the following chemical equation?

• 1 to 6

• 3 to 2

• 4 to 6

• 2 to 3

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

The most steps are required to solve stoichiometry problems when the reactant is given in grams and the product is sought in

• moles.

• grams.

• liters.

• number of atoms.

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Pb\left(NO_3\right)_2+2KI\ \rightarrow\ PbI_2+2KNO_3 how many moles of lead iodide PbI_2 are produced of 300 grams potassium iodide KI when Pb\left(NO_3\right)_2 is in excess?

• 114.78 mol PbI₂

• 0.904 grams PbI₂

• 0.904 mol PbI₂

• 114.78 grams PbI₂

• 408 g KClO₃

• 804 g KClO₃

• 598 g KClO₃

• There is not enough information.

In solving a mass-mass (gram to gram) conversion, it is necessary to convert to the given mass to moles.

• true

• false

What the are units for molar mass?

• grams/mole

• atoms/mole

• grams/atoms

• mloes/atom

Tags

NGSS.HS-PS1-7

What is the molar mass for water (H₂O)?

• 33 g/mol

• 14.32 g/mol

• 2.02 g/mol

• 18.02 g/mol