Taking into account the definition of molar mass, 0.051 moles of platinum would be in 10.0 g of this metal.
You have to know that molar mass is the mass of one mole of a substance, which can be an element or a compound.
Therefore, knowing the molar mass, the number of moles can be calculated using the expression:
[tex]mol=\frac{mass}{molar mass}[/tex]
In the periodic table, you can find the molar mass of the elements, also called atomic mass or atomic weight.
In this case, platinum is a grayish-white, precious, heavy, malleable and ductile transition metal whose atomic mass is 195 [tex]\frac{g}{mole}[/tex]. Being mass equals 10 g, then:
[tex]mol=\frac{10 g}{195 \frac{g}{mole} }[/tex]
Solving:
mol=0.051
Finally, 0.051 moles of platinum would be in 10.0 g of this metal.
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