What is the mass of 5.22×10^21 platinum atoms? ?

1.69g

Explanation:

To solve the problem you need to know the Avogadro´s number and the molar mass of the Platinum.

The Avogadro´s number is . For the platinum it means that there are atoms of platinum for each mol.

And the molar mass for the platinum is , that is the mass in grams of each mol of platinum.

So, with this information we can solve the problem as follows:

of Pt

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solid ice forms on leaves.

water droplets form on grass.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer