0.243 g of a gas occupies 200.9 mL at STP. What is its molecular weight? 254 mL

Question

0.243 g of a gas occupies 200.9 mL at STP. What is its molecular weight? 254 mL of oxygen gas is compressed from 15.5 atm to 33.3 atm of pressure, what is the new volume (in mL) at constant QUESTION To dilute a concentrated acid: o-taken aswww You have to wear gloves when you work with acids because they .ar" comme QUESTION To determine pressure of the gas over water you have to use: QUESTION Under conditions of fixed temperature and amount of gas, Boyle's law requires that PV1-P2V2 ll. constant llI. P1iP2 V21

Explanation / Answer

Q1)

volume = 200.9 mL = 0.2009 L

pressure = 1 atm

temperature = 273 K

P V = n R T

1 x 0.2009 = n x 0.0821 x 273

n = 8.96 x 10^-3

moles = mass / molar mass

8.96 x 10^-3 = 0.243 / molar mass

molar mass = 27.1 g/mol

2)

254 x 15.5 = V x 33.3

V = 118 mL

new volume = 118 mL

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