Page 18 - Surviving Chemistry BFF Homework Helper and Test Prep Preview

What pressure in atm is equivalent to 259 kPa?

1.0 atm

1 atm = 101.3 kPa 259 kPa x ----------- = 2.6 atm
101.3 kPa
numerical setup calculated result

What volume of He(g) in milliliters is equivalent
to 1.33 L of He(g)?

1.33 L 1 L
1 L = 1000 mL --------- = ----------- numerical setup
X 1000 mL

calculated
X = (1000 mL)(1.33) = 1330 mL result.

Only Kelvin temperature should be used in gas
law calculations.

o
o (See example conversions from C to K on pg. 12)
K = 273 + C

A 50. mL sample of a gas is at 2.0 atm and 320 K.

What will be the new volume of the gas at STP?

P1V1 P2V2 (50.)(2.0) (1.0 ) (V2) Standard
------ = ------- --------- = ----------
Temperature
T1 T2 320 273 Pressure
85 ml = V2

At constant temperature, what is the new volume
of a 3.0 L sample of O2 gas if its pressure is changed
from 0.50 atm to 0.25 atm?

(0.50)(3.0) = (0.25)(V2) numerical setup
P1V1 = P2V2

6.0 L = V2 calculated result

The volume of a gas is 25 mL at 280 K. If the
pressure is held constant, at what temperature would

the volume of the gas increase to 75 mL?

V1 V2 25 75
---- = ----- ----- = ----- numerical setup
T1 T2 280 T2

840 K = T2 calculated result

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