Stoichiometry Practice

4 Al + 3 O₂ –> 2 Al₂O₃  How much aluminum would be needed to completely react with 45 grams of O₂?

• 05 moles

• 3.75 moles

• 1.875 grams

• 1.875 moles

How many liters of carbon dioxide at STP are produced from 10.0 L of carbon monoxide at STP?

• 10.0 L

• 20.0 L

• 5010 L

• 0.0199

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 460 grams

• 452 grams

• 462 grams

How many liters of NH₃ are needed to react completely with 30.0L of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• 5.0 L

• 20.0 L

• 7.5 L

• 120.0 L

How many moles are in 19.82 g Mg? 

• 1.226mol Mg

• 481.7mol Mg

• 1.000mol Mg

•  0.82 mol Mg

In a chemical reaction, the mass of reactants ___.

• is less than the mass of products

• is greater than the mass of products

• has no relationship to the mass of products

• is equal to the mass of products

Tags

NGSS.HS-PS1-7

Mole ratios are obtained from the _____.

• balanced chemical equation

• periodic table

• molar mass

The __________ in a balanced equation reveals the mole ratios of the substances involved.

• subscript

• coefficients

• superscript

• total number in each compound

If 56 grams of calcium metal are dropped into hydrochloric acid, how many liters of gas are made?

Reaction: Ca + HCl → CaCl2 + H2

• 1.4 L

• 100 L

• 22.4 L

• 31.36 L