are these chemistry answers correct? please explain if incorrect?

Question

1. at 525 mm Hg and 85 degrees C, the volume of a sample of nitrogen gas is 26.8 L. What is the volume at STP?

a. 1 L
b. 10.9 L
c. 15.3 L

is it b?


2. when a 0.500 mole of sodium is produced according to the reaction 2NaN3 -->3N2 + 2Na, how many moles of nitrogen gas are also produced?

a. 0.750 moles
b. 1.5 moles
c. 2 moles
d. 3 moles

is it a?


3. a cylinder of compressed gas has a volume of 3.85 L and a pressure of 463 kPa. What volume would the gas occupy if it were allowed to escape into a balloon at a pressure of 110 kPa? Assume constant temperature.

a. 11.5 L
b. 16.2 L
c. 22.4 L
d. 28.9 L

is it c?


4. a cylinder contains 6.94 L of a gas at a temperature of 15 degrees C. The cylinder is heated, and a piston moves in the cylinder so that constant pressure is maintained. If the final volume of the gas in the cylinder is 8.50 L, what is the final temperature?

a. 12.2 degrees C
b. 38 degrees C
c. 54.6 deg C
d. 80 deg C

is it b?

Answer 1

1. Since the amount of gas is a constant, we should have:
PV/T = pv/t, or V = Tpv/(Pt) = 273*525*26.8/(760*358) = 14.1(L).
I do not know why nothing matched. Did you have any typo?

2. (0.500/2)*3 = 0.750
(a) is correct.

3. It is simply PV = pv, or V = pv/P = 3.85*(463/110) = 16.2(L)
(c) is NOT correct.

4. V/T = v/t, or T = (V/v)t = (8.50/6.94)*(273+15)-273 = 80 (°C)
(b) is NOT correct.

Answer 2

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