6.13

Consider this hypothetical reaction: A+4B→C+3D. Assume that the equation is balanced. Which mole ratio will produce the most product?

A/4B

Consider this hypothetical reaction: A+3B→C+3D. Assume that the equation is balanced. In which reactant mole ratios will reactant B be the limiting reagent?

A/B

Which compound does not form a precipitate when reacted with sodium hydroxide?

NaNO3

Which statement is true about 22.4 L each of hydrogen, ammonia, and uranium dioxide gas assuming that the temperature and pressure are the same for all the gases?

The gases have the same number of molecules.

What would cause the percent yield of a reaction to be less than 100%?

The product participates in a side reaction.

What does the law of multiple proportions account for?

subscripts in chemical formulas

A sample of nitrogen gas (N2) contains 1.2 × 10^24 atoms of nitrogen. About how many moles of nitrogen gas are in the sample?

1.0

Consider this reaction: Li3N (s) + 3H2O (l)→NH3 (g) + 3LiOH (l) You need to make 24 g LiOH . How many grams of Li3N must you react with excess water?

11.7 g

Consider this reaction: H2(g)+Cl2(g)→2HCl(g) How many liters of HCl are produced when 56 L of chlorine are reacted with excess hydrogen? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

112 L

What is the formula mass of calcium sulfate dihydrate [CaSO4⋅2H2O]? Be sure to add the water of hydration, which is the 2H2O part (water surrounding the calcium sulfate).

172 g/mol

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6(g)+7O2(g)→4CO2(g)+6H2O(l) How many moles of water will be produced when 8 moles of ethane are burned?

24 moles

When aluminum oxidizes in air, it forms aluminum oxide (Al2O3): 4Al(s)+3O2(g)→2Al2O3(s) A 51 g sheet of aluminum oxide formed completely in excess oxygen. How many grams of aluminum were oxidized?

27 g

Two molecules of one reactant combine with 3 molecules of another to produce 5 molecules of a product. Which equation is the correct representation of the reaction?

2A+3B→5C

What is the formula mass (molar mass) of sucrose (C12H22O11), table sugar?

342 g/mol

Ammonia (NH3) can be produced by the reaction of hydrogen gas with nitrogen gas: 3H2 + N2→2NH3 A chemist reacts 2.00 mol H2 with excess N2 . The reaction yields 0.54 mol NH3 . What is the percent yield of the reaction?

40%

In a spacecraft, this reaction occurs: CO2(g)+2LiOH(s)→LiCO3(s)+H2O(l) How many liters of carbon dioxide will 4 moles of lithium hydroxide (LiOH) absorb? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

45 L

A chemical reaction yields 2 moles of lithium hydroxide (LiOH). How many grams of lithium hydroxide are present?

48 g

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6(g)+7O2(g)→4CO2(g)+6H2O(l) How many liters of carbon dioxide will be produced when 269 L of ethane are burned? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

538 L

Approximately how many particles are in a mole?

6.0 × 10^23

What is the volume of 3 moles of methane (CH4) ? (One mole of any gas occupies 22.4 L under certain conditions of temperature and pressure. Assume those conditions for this question.)

67.2 L