The rate of decrease in N_{2}H_{4} partial pressure in a closed reaction vessel is 75 torr/h. What is the rate of change of ammonia partial pressures and total pressure in vessel?

N_{2}H_{4}(g) + H_{2}(g) → 2 NH_{3}(g)

a) 75 torr, 300 torr

b) 150 torr, 300 torr

c) 150 torr, 150 torr

d) 150 torr, 0 torr

e) 75 torr, 0 torr

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