Mathematics of Chemistry

1) Which of the following is not equivalent to a mole of substance?

1. 22.4L of an ideal gas at STP
2. atomic number
3. gram atomic mass
4. 6.02 x 10²³

2) The gram molecular mass for H₂SO₄ is

1. 64 grams
2. 196 grams
3. 7 grams
4. 98 grams

3) The percent composition by weight of oxygen in H₂SO₄ is

1. 32 percent
2. 98 percent
3. 64 percent
4. 65.3 percent

4) Ionic solutions change the boiling and freezing points ________ nonelectrolytes.

1. more than
2. less than
3. the same as
4. inversely compared to

5) According to Graham's law, gases diffuse at a rate ________ proportional to the square roots of their molecular masses.

1. directly
2. inversely
3. equally
4. none of the above

6) Which of the following gases will diffuse most rapidly at STP?

1. He
2. Ne
3. O(2)
4. N(2)

7) What is the volume occupied by 11.0 grams of a gas at STP if the molecular mass of the gas is 44.0?

1. 5.60 L
2. 11.2 L
3. 22.4 L
4. 89.6 L

8) What is the total number of moles of solute contained in 0.50 liter of 3.0 M HCl?

1. 1.0
2. 1.5
3. 3.0
4. 3.5

9) The percent by mass of nitrogen in N₂O is

1. 8.0
2. 16
3. 32
4. 64

10) The volume of a 1.00-mole sample of an ideal gas will decrease when the

1. pressure decreases and the temperature decreases
2. pressure decreases and the temperature increases
3. pressure increases and the temperature decreases
4. perssure increases and the temperature increases