What is the mass of 5.28×10^21 platinum atoms

1, 71 g

Explanation:

The atomic mass of platinum is 195,1 g/mol, and it has the equivalent of the avogadro's number atoms (6,022x10^23 atoms).

Doing a three rule:

195,1 g ------------ 6,022x10^23 atoms

  x    g ------------ 5,28x10^21 atoms

Doing the maths:

the answer is 303.15 or 303

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