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3 years ago

What is the inital volume of a gas at STP, if its final volume is 80.0 mL at 109 kPa and –12.5°C.

Chemistry

2 answers:

Kobotan [32]3 years ago

5 0

Answer:

77.9 mL

Explanation:

Initial conditions

V₁ = ?
P₁ = 1 atm = 101.325 kPa
T₁ = 273 K

Final conditions

V₂ = 80.0 mL
P₂ = 109 kPa
T₂ = -12.5°C = 260.5 K

Equating Inital and Final conditions

V₁ = P₂V₂T₁/P₁T₂
V₁ = 101.325 × 80 × 273 / 109 × 260.5
V₁ = 2212938/28394.5
V₁ = 77.9 mL

tigry1 [53]3 years ago

4 0

Apply combine gas law

$\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}$

$\\ \rm\Rrightarrow \dfrac{101.325V_1}{273}=\dfrac{109(80)}{273-12.5}$

$\\ \rm\Rrightarrow 0.37V_1=33.5$

$\\ \rm\Rrightarrow V_1=90.5mL$

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