Stoichiometry Lesson

Stoichiometry

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Multiple Choice

What is the molar mass of Cl₂?

• 17 g/mol

• 35.5 g/mo;

• 71.0 g/mol

• 89 g/mol

Multiple Choice

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

Multiple Choice

What is the molar mass of C₆H₁₂O₆?

• 180.15

• 180.36

• 180.00

• 180.06

Multiple Choice

This recipe makes 3 dozen cookies. How many eggs are needed to make 3 dozen cookies?

• 2 eggs

• 1 teaspoon vanilla extract

• 1 cup butter

• 2 cups semisweet chocolate chips

• 1 cup packed brown sugar

Multiple Choice

How much butter is needed for 2 cups of chocolate chips?

• 2 eggs

• 1 teaspoon vanilla extract

• 1 cup butter

• 2 cups semisweet chocolate chips

• 1 cup packed brown sugar

Multiple Choice

How many eggs would we need to make 9 dozen cookies? (This recipie makes 3 dozen)

• 6 eggs

• 5 eggs

• 4 eggs

• 2 eggs

• 1 egg

Multiple Choice

How much brown sugar would I need if I had ½ cup white sugar?

• 2 eggs

• 1 teaspoon vanilla extract

• 1 cup butter

• 2 cups semisweet chocolate chips

• 1 cup packed brown sugar

Multiple Choice

Given the reaction: 4Al + 3O₂ --> 2Al₂O₃

How many moles of Aluminum oxide do you have if you have 2 moles of Al?

• 3 mole

• 2 mole

• 1 mole

• 0.5 mole

Multiple Choice

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 4:3

• 2:3

Multiple Choice

N₂ + 3H₂ → 2NH₃

What is the mole ratio between Nitrogen and Ammonium in the above reaction?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

Multiple Choice

_BaS + _PtF₂ → _BaF₂ + _PtS

• 1 BaS + 1 PtF₂ → 1 BaF₂ + 1 PtS
• 4 BaS + 2 PtF₂ → 1 BaF₂ +  1 PtS
• 1 BaS + 2 PtF₂→ 2 BaF₂ +  2 PtS
• 1 BaS + 3 PtF₂ →1 BaF₂ +  2 PtS

Multiple Choice

3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Multiple Choice

How many moles are in 32 grams of Oxygen (O)?

• 3

• 2

• 1

• 4

Multiple Choice

4NH₃ + 5O₂-->4NO + 6H₂O

What is the total number of moles of H₂O produced when 12 mole of NH₃ is completely consumed?

• 15

• 18

• 20

• 24

Multiple Choice

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron (Fe) can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Multiple Choice

All alkali metals react with water to produce hydrogen gas and the corresponding alkaline metal hydroxide. A typical reaction is that between lithium and water :

2Li(s) + 2H₂O(l) →2LiOH(aq) + H₂(g)

Calculate the mass of H2 gas formed when 40.0 g of Li react with water

• 4.21 g

• 7.31 g

• 5.80 g

• 4.42 g