Formula for partial pressure of gas in a mixture? - Thermodynamics

Q.  A mixture of ideal gases of volume V at temperature T, contains n1 moles of gas A, n2 moles of gas B and n3 moles of gas C. What is a correct formula for partial pressure (pB) of gas B?
- Published on 21 Aug 15

a. (pB) = ((1/3)(n1+n2+n3) RT) / V
b. (pB) = ((n1 + n3) RT) / V
c. (pB) = (n2 RT) / V
d. (pB) = (n2(n1 + n3) RT) / V

ANSWER: (pB) = (n2 RT) / V

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