Final Final

Question 1

To convert m to nm…

Answer 1

Multiply by 10⁻⁹

Question 2

To convert m to nm….

Answer 2

Multiply by 10⁹

Question 3

The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O. The combustion of 28.8g of ammonia consumes _______g of oxygen

Answer 3

94.9

Question 4

A 3.82g sample of magnesium nitride is reacted with 7.73g of water to form ammonia and magnesium oxide. The yield of MgO is 3.60g. What is the percent yield?

Answer 4

78.8

Question 5

A 31.5 mL aliquot of H₂SO₄ (aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was _______

Answer 5

0.0051

Question 6

A sample of gas originally at 25 C and 1.00 atm pressure in a 2.5 L container is allowed to expand until pressure is 0.85 atm and the temperature is 15 C. The final volume of the gas is _____ L.

Answer 6

2.8

Question 7

What mass (g) of NaN₃ is required to provide 40.0 L of N₂ at 25.0 C and 763 torr?

2NaN₃ (s) –> 2Na (s) + 3N₂ (g)

Answer 7

71.7

Question 8

What is planck’s constant?

Answer 8

h= 6.626 x 10⁻³⁴