Concept of atoms and molecules; Dalton's atomic theory; mole concept; chemical formulae; balanced equations; stoichiometric calculations; concentration in mole fraction, molarity, molality and normality.
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Q1 · General Topics · MEDIUM
The time required for 75% completion of a first-order reaction is 120 minutes. The time required for 93.75% completion of the same reaction (in minutes) is:
Q2 · General Topics · EASY
A reaction releases 180 kJ of energy when 2 moles of reactant are completely converted. If only 0.5 moles react under the same conditions, the energy released is: