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Stoich Practice

Last updated over 1 year ago
12 questions
Solve the following stoichiometry problems using any of the three methods. You may use different methods for each problem. Make sure you round the answer to the correct significant figures. Base it on the number of significant figures in your starting number. Make sure to include units in your answer.
4

Calculate how many grams of iron can be made from 16.5 grams of Fe2O3 by the following equation.
Fe2O3 + 3 H2 → 2 Fe + 3 H2O

6

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4

The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.46 grams of water. How many grams of butane burned?
2C4H10 + 13O2 → 8CO2 + 10H2O

6

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4

Under the right conditions, ammonia can be converted to nitric oxide, NO by the following reaction. How many grams of oxygen are needed to react with 56.8 grams of ammonia by this reaction?
4NH3 + 5O2 → 4NO + 6H2O

6

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4

One way to prepare iodine is to mix sodium iodate, NaIO3, with hydriodic acid, HI. The following reaction occurs. Calculate the grams of iodine that can be made this way from 16.4 grams of NaIO3.
NaIO3 + 6 HI → 3 I2 + NaI + 3 H2O

6

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4

Calculate how many grams of K2Cr2O7 are needed to make 35.8 grams of I2 according to the following equation.
K2Cr2O7 + 6NaI + 7 H2SO4 → Cr2(SO4)3 + 3I2 + 7H2O + 3Na2SO4 + K2SO4

6

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4

During its combustion, ethane C2H6, combines with oxygen O2 to give carbon dioxide and water. A sample of ethane was burned completely and the water that formed has a mass of 1.61 grams. How much ethane, in grams, was in the sample? (You are going to have to write and balance the reaction first)

6

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