3rd quarter exam review

Magnesium reacts with chlorine gas to produce magnesium chloride. When this equation is balanced, what is the mole ratio of magnesium to chlorine?

• 1:1

• 1:2

• 2:1

• 2:2

How many grams of hydrogen gas are needed to react completely with 54.0 g of oxygen gas, given the following unbalanced chemical reaction:

H₂ + O₂ ---> H₂O

• 4.4 g

• 6.80 g

• 1.6 g

• 3.4 g

What is the volume of ammonia gas will react with 22.5 L of oxygen gas? The reaction is: ammonia plus oxygen gas produces water and nitrogen gas.

• 30.0 L

• 15.0 L

• 22.4 L

• 44.8 L

In a certain experiment, 40.0g KClO₃ is heated until it completely decomposes. What is the theoretical yield of oxygen gas? 2KClO₃(s)→2KCl(s)+3O₂(g)

• 22.4 g

• 14.0 g

• 6.7 g

• 15.7 g

2KClO₃(s)→2KCl(s)+3O₂(g)

The theoretical yield of the reaction above was 15.7 g of oxygen gas. If the mass collected from the lab is found to be 14.9g, What is the percent yield for the reaction?

• 75 %

• 80.2 %

• 94.9 %

• 105.3 %

What is the volume of gas at 2.00 atm and 200.0 K if its original volume was 300.0 L at 0.250 atm and 400.0 K?

• 60.0 L

• 18.8 L

• 2.5 L

• .250 L

A balloon of air now occupies 10.0 L at 25.0 °C and 1.00 atm. What temperature was it initially, if it occupied 9.40 L and was in a freezer with a pressure of 0.939 atm?

• -10 degrees celsius

• -20 degrees celsius

• 273.15 degrees celsius

• 75.2 degrees celsius

Determine the volume of occupied by 2.34 grams of carbon dioxide gas at STP.

• 3.2 L

• 22.4 L

• 6.0 L

• 1.19 L

What is the molarity of 245.0 g of H₂SO₄ dissolved in 1.000 L of solution?

• 2.5 M

• 3.2 M

• 5.5 M

• 1.0 M

On a solubility graph, how do you know which substances are gases and which are solutes?

• With increasing temperature, the solubility of solutes decreases and the solubility of gases increases.

• With increasing temperature, the solubility of solutes increases and the solubility of gases decreases.

• It is not possible to determine, unless you know the saturation of the substances.

• It is not possible to determine on a solubility graph.