Need help calculating temp pressure and volume?

2016-03-22 3:36 pm

need help with these couple problems
Thank You :) also if you could set them up as well (All of them please )

1.) What is the pressure exerted by 2.79 moles of N2 in a 63.24Liter container at 25 degrees C ?

2.) how many moles of nitrogen are in a flask with a volume of 640Liters at a pressure of 260kPa and a temperature of -56 degrees C ?

3.) determine the volume occupied by 0.737mol of a gas at 32 degrees C if pressure is 92.40kPa

4.) A balloon contains 4.70Liters H2 at 108.56kPa and 37 degrees C. How many grams of hydrogen does the balloon contain ?

Also PV = nRT R=8.31LkPa/Kmol

回答 (1)

micatkie

2016-03-22 4:02 pm

1.)
P = ? kPa
V = 63.24 L
n = 2.79 mol
T = 273 + 25 = 298 K
R = 8.31 L kPa / (K mol)

PV = nRT
Pressure, P = nRT/V = 2.79 × 8.31 × 298 / 63.24 = 109 kPa

====
2.)
P = 260 kPa
V = 640 L
n = ? mol
T = 273 - 56 = 217 K
R = 8.31 L kPa / (K mol)

PV = nRT
No. of moles, n = PV/(RT) = 260 × 640 / (8.31 × 217) = 92.3 mol

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3.)
P = 92.40 kPa
V = ? L
n = 0.737 mol
T = 273 + 32 = 305 K
R = 8.31 L kPa / (K mol)

PV = nRT
Volume, V = nRT/P = 0.737 × 8.31 × 305 / 92.40 = 20.2 L

====
4.
P = 108.56 kPa
V = 4.70 L
n = ? mol
T = 273 + 37 = 310 K
R = 8.31 L kPa / (K mol)

PV = nRT
No. of moles, n = PV/(RT) = 108.56 × 4.70 / (8.31 × 310) mol

Molar mass of H₂ = 1.008 × 2 = 2.016 g/mol
Mass = [108.56 × 4.70 / (8.31 × 310)] × 2.016 = 0.399 g

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