Exam 3 Review

Stoichiometry

100

In the reaction below, how many moles of hydrogen will be produced when reacting with 0.0204 moles of sodium?

2Na + 2H₂O -> 2NaOH + H₂

0.0102 mol H₂

200

If you start with 10 g of Lithium Hydroxide, how many grams of Lithium Bromide will be produced?

LiOH + HBr -> LiBr + H₂O

36.25 g LiBr

300

How many grams of hydrogen are needed to react completely with 50 g of Nitrogen?

N₂ + H₂ -> NH₃

10.7 g H₂

400

Using the equation, find the number of moles of Al used to produce 9.9 moles of H₂ 

Al + HCl -> AlCl₃ + H₂

6.6 moles Al

500

If you reacted 1.09 x 10^-3 g of S₈ , how many grams of P(C₆H₅ )₃S would be produced?

S₈ + P(C₆H₅)₃ -> P(C₆H₅)₃S

1.00 x 10^-2 g P(C₆H₅)S

Gas Laws

100

45.0 L of O2 gas at a pressure of 1.0 atm is compressed to a final pressure of 3.0 atm at constant temperature. What is the final volume?

15 L

200

A balloon filled with 0.025 L of gas at 24 ^oC is heated to 49 ^oC at constant pressure. What is the final volume of gas inside the balloon in mL?

27 mL

300

A gas at 275 K and 1.0200 atm is decreased to 0.0251 atm at constant volume. What is the final pressure?

6.77 atm

400

If I have a 50. L container that holds 45 moles of gas at a temperature of 200.0 C, what is the pressure inside the container?

35 atm

500

A fixed amount of gas fills a space at 2.9 x 10² K and 7.9 x 10² torr. After heating the gas to 3.4 x 10² K and increasing the pressuring to 920 torr, the gas fills
8.97 L of space. What is the original volume?

8.9 L

Molarity

100

Convert 60.1 g of C₂H₄O₂ into moles

1 mol

200

0.5 moles of sodium chloride is dissolved to make 0.05 liters of solution

10 M

300

Calculate molarity by dissolving 25.0g NaOH in 325 mL of solution.

1.92 mol/L

400

Calculate molarity by dissolving 25.0g NaOH in 325 mL of solution?

0.85 M

500

Calculate molarity by dissolving 25.0g NaOH in 325 mL of solution.

31.3 M

Sig Figs

100

How many sig figs are in 236.32?

5 sig figs

200

How many sig figs are in 0.00340

3 sig figs

300

How many sig figs are in 320001

6 sig figs

400

Calculate 23.7 x 3.8 to the correct number of sig figs.

9.0

500

Calculate to the correct number of sig figs: 28.367 / 3.74

7.58

Scientific Notation

100

Express the following in scientific notation: 0.00125

1.25 x 10^-3

200

Express the following in scientific notation: 2,000,000,000

2 x 10^9

300

Express the following in scientific notation: 27 x 10^3

2.7 x 10^4

400

Express the following in scientific notation: 0.00179

1.79 x 10^-3

500

Express the following in scientific notation: 367 x 10^-3

3.67 x 10^-1