WAEC Chemistry 2010 Theory — Question 15
Question 15 of 46 from the West African Examinations Council (WAEC) Chemistry 2010 Theory paper, with the correct answer and a full explanation.
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2c(ii) If 200 cm³ of carbon (IV) oxide collected over water at 18°C and 700 mmHg, determine the volume of the dry gas at s.t.p. [standard vapour pressure of water at 18°C = 15 mmHg]
Model answer
V1=200cm³, T1=18°C=291K. P1=700mmHg-15mmHg=685mmHg. V2=? T2=273K, P2=760mmHg. Using P1V1/T1 = P2V2/T2: V2 = P1V1T2/(P2T1) = (685x200x273)/(760x291) = 169.11 cm³.
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