Question

The formula of nickel oxide is Ni\(_{98}\)O\(_{100}\). What is the approximate percentage of Ni\(^{2+}\) in it?

• A. 92
• B. 94
• C. 96
• D. 98

Hint:

When calculating the percentage of an element in a compound, ensure you use the molar masses of the elements and the correct stoichiometric coefficients.

Answer 1

The Correct Option is C

The molar mass of Ni\(_{98}\)O\(_{100}\) is calculated by adding the molar masses of Ni and O. The percentage of Ni\(^{2+}\) can be calculated by dividing the mass of Ni by the total mass and multiplying by 100. For Ni, with atomic mass 58.7, the mass of Ni in Ni\(_{98}\) is approximately 98 * 58.7, and the total mass is 98 * 58.7 + 100 * 16.