Question

What is the mass of 0.513 mol Al2O3? Give your answer to the correct number of significant figures. (Molar mass of Al2O3 = 102.0 g/mol)
0.513 mol Al2O3

Answer 1

.513mol x (102g/1mol)

Essentially, this is .513 x 102
Which equals: 52.326
But because you can only have 3 significant figures, your answer is:
52.3 grams

I hope this Helps!

Answer 2

Answer : The mass of 0.513 mole $Al_2O_3$ is, 52.3 grams

Solution : Given,

Moles of $Al_2O_3$ = 0.513 mole

Molar mass of $Al_2O_3$ = 102.0 g/mole

Formula used :

$\text{Moles of }Al_2O_3=\frac{\text{Mass of }Al_2O_3}{\text{Molar mass of }Al_2O_3}$

Now put all the given values in this formula, we get the mass of $Al_2O_3$

$0.513mole=\frac{\text{Mass of }Al_2O_3}{102.0g/mole}$

$\text{Mass of }Al_2O_3=52.3g$

Therefore, the mass of 0.513 mole $Al_2O_3$ is, 52.3 grams