Question 1

What steps of the Stoichiometry Train are used in the following problem: Calculate the number of moles of potassium chlorate that must decompose to produce potassium chloride and 1.8 moles of oxygen gas.

Accepted Answer

mol ${\rightarrow}$ mol

Answer

mol ${\rightarrow}$ mol ${\rightarrow}$ g ${\rightarrow}$ mol

Answer

g ${\rightarrow}$  mol ${\rightarrow}$ mol

Answer

g ${\rightarrow}$ mol

Question 2

What steps of the Stoichiometry Train are used in the following problem: In a single displacement reaction, magnesium metal reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas. How many moles of hydrochloric acid are needed to completely react with 2.43 g of magnesium?

Accepted Answer

g ${\rightarrow}$ mol ${\rightarrow}$ mol

Answer

g ${\rightarrow}$ mol

Answer

g ${\rightarrow}$ mol${\rightarrow}$ mol${\rightarrow}$ g

Answer

mol ${\rightarrow}$ mol ${\rightarrow}$ g ${\rightarrow}$ mol

Question 3

What steps of the Stoichiometry Train are used in the following problem: When hydrochloric acid (HCl) is added to sodium hydrogen carbonate, the products are water, aqueous sodium chloride and carbon dioxide gas.  What mass of CO2 can be collected when 10.0 g of sodium hydrogen carbonate reacts with excess HCl?

Accepted Answer

g ${\rightarrow}$ mol ${\rightarrow}$ mol ${\rightarrow}$ g

Answer

g ${\rightarrow}$ mol ${\rightarrow}$mol

Answer

mol ${\rightarrow}$ mol ${\rightarrow}$ g

Answer

g ${\rightarrow}$ mol

Question 4

What steps of the Stoichiometry Train are used in the following problem: Determine the mass of water vapor you would expect to form in the reaction between 15.8 g of NH3 and excess oxygen to produce water and nitric oxide (NO).

Accepted Answer

g ${\rightarrow}$ mol ${\rightarrow}$ mol ${\rightarrow}$ g

Answer

mol ${\rightarrow}$ g

Answer

g ${\rightarrow}$mol ${\rightarrow}$ mol

Answer

mol ${\rightarrow}$ mol ${\rightarrow}$ g

Question 5

What steps of the Stoichiometry Train are used in the following problem: If 20 moles glucose, C6H12O6, reacts with oxygen gas to produce carbon dioxide and water, how many grams of oxygen will you have to breathe in to burn the glucose?

Accepted Answer

mol ${\rightarrow}$ mol ${\rightarrow}$ g

Answer

mol ${\rightarrow}$ mol

Answer

g ${\rightarrow}$ mol ${\rightarrow}$mol

Answer

g ${\rightarrow}$ mol ${\rightarrow}$ mol ${\rightarrow}$ g

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