WAEC Physics 2013 Objective — Question 19
Question 19 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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The volume of a given mass of gas at 27°C and 800 mmHg is 76 cm³. Calculate its volume at s.t.p.
- A. 100.0 cm³
- B. 72.8 cm³Correct
- C. 60.0 cm³
- D. 36.4 cm³
Explanation
Using the general gas law: P1V1/T1 = P2V2/T2, with T1=300K, P1=800mmHg, V1=76cm³, T2=273K, P2=760mmHg: V2 = (800×76×273)/(300×760) = 72.8 cm³.
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