alleryThe number of moles in 23.3 g of zinc (atomic mass ≈ 65.4) is approximately _____.
A0.25
B0.53
C0.35
D0.37
Answer & Solution
Correct answer: C. 0.35
1. Moles = mass / atomic mass.
2. Moles = 23.3 / 65.4.
3. = 0.356 ≈ 0.35.
_Source: RRB Group D CEN-02/2018 PYQ, Q.17._
Keep practising Chemical Thermodynamics
Browse all Chemical Thermodynamics questions for AP Intermediate 1st Year, or explore more Chemistry topics.
Related questions
A process whose enthalpy and entropy changes share the same arithmetic sign will show:At minus 10.00 degrees Celsius the entropy change of the universe for melting is negative,Melting is described as spontaneous at 10.00 degrees Celsius because at that temperature:K_sp of a sparingly soluble salt AB at 25 °C is 4 × 10⁻¹⁰. Molar solubility s of AB is:A buffer solution is most resistant to pH change when:K_w (ionic product of water at 25 °C) is:The pH of a 0.01 M HCl solution is:For an exothermic reaction at equilibrium, raising the temperature: