Question

calculate the mass of 220 cm cube of oxygen at S.T.P

Answer 1

Explanation:

0.13 grams is your answer

Answer 2

The mass of 220 cm cube of oxygen at S.T.P is 0.288 g

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number  of particles.

Standard condition of temperature (STP)  is 273 K and atmospheric pressure is 1 atm respectively.

According to the ideal gas equation

$PV=nRT$

P = Pressure of the gas = 1 atm

V= Volume of the gas = $220cm^3=220ml=0.22L$     (1L=1000ml)

T= Temperature of the gas = 273 K  

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= ?

$n=\frac{PV}{RT}=\frac{1\times 0.22}{0.0821\times 273}=0.009moles$

Mass of $O_2=moles\times {\text {Molar mass}}=0.009\times 32 g/mol=0.288g$

Thus mass of 220 cm cube of oxygen at S.T.P is 0.288 g

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