Stoichiometry
1 kg of calcium carbide (CaC₂) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?

10
15
5
20

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Stoichiometry
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

Sizes of the component molecules are approximately equal
Attractive forces between like and unlike molecules are approximately equal
All of these
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution

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Stoichiometry
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

State of aggregation & the state of combination at the beginning & the end of the reaction
Number of intermediate chemical reactions involved
Temperature & pressure
None of these

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