Chemistry - Mole Concept Question with Solution | TestHub
A 12.0 g sample of a gaseous hydrocarbon X contains carbon by mass. The sample is placed in a rigid 24.6 L sealed vessel at 300 K along with an equal mass of a diatomic gas Y . On ignition, the reaction proceeds completely according to:
X + 6Y → 4P + 4Q
where, P is a gas that turns lime water milky and Q is a compound that is liquid at 298 K but exists as a gas at 400 K. Assume ideal behaviour. Take R = 0.08L . atm . mol-1 . K–1
Options:(select one or more)
Answer:
Solution:
P is (turns lime water milky) and Q is , so
empirical formula ; since are formed, . and is limiting.
X consumed unreacted , so (1) is false. Total moles increase after reaction at pressure increases, so (2) is true. On cooling to condenses and temperature drops ⇒ pressure decreases due to both effects; hence (4) is true.