The total number of neutrons in 5g of H2O are: 1 NA = 6.023 x 10^23
Correct answer: C. 2.5 NA
- A. 25 NA
- B. 1.1 NA
- C. 2.5 NA
- D. 0.5 NA
Explanation
The Protium (hydrogen isotope) does not have any neutrons. We assume a deuterium isotope that has one neutron. Molar mass of H2O (deuterium) = 2× 2 + 16 = 20 Number of neutrons in 1 H2O (deuterium) molecule = 1×2+8 = 10No. of moles of deuterium in 5g = 5/20 = ¼ NA No. of neutrons in 5g = 1/4 NA ×10 = 2.5 NAThis is numerical so it can only have one answer so option C is correct
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