Question

calculate the mass of 6.5 into 10 raise to power 24 atoms of cold the molar mass of the gold is 197 gram mole inverse​

Answer 1

Given Gold atoms;

N = 6.5 × 10²⁴ atoms

M(Au) = 197

let us suppose (fo the ease of calculation) NA = Avagadro's number = 6 × 10²³

Thus moles;

n = W/M & n = N/NA

Therefore

• W/M = N/NA
• W/197 = 6.5 × 10²⁴ / 6 × 10²³
• W/197 ia approximately 1.0 × 10
• W = 197 × 10
• Thus W = 1970g or 1.97kg approximately.

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