WAEC Chemistry 2020 Objective — Question 30
Question 30 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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The initial volume and pressure of a given mass of gas is V and 3P. What is its pressure if its volume is increased to 2V at constant temperature?
- A. 3P
- B. 2P
- C. 3/2 PCorrect
- D. 2/3 P
Explanation
Since temperature is constant, we use Boyle's law: P1V1=P2V2. 3P x V=P2 x 2V. P2=(3PxV)/(2V)=3/2 P.
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