Question

What is the mass of 0.50 moles of Na? 11 grams 46 grams 3.0 × 1023 grams 6.0 × 1023 grams

Answer 1

n= mass ÷ molar mass

mass= n × molar mass

=0.50 × 23

=11.5 grams

Answer 2

Answer : The mass of 0.50 moles of Na is, 11 grams

Explanation : Given,

Moles of Na = 0.50 mole

Molar mass of Na = 22.99 g/mole

Formula used :

$n=\frac{w}{M}$

where,

n = number of moles of Na

w = mass of Na

M = molar mass of Na

Now put all the given values in this formula, we get the mass of Na.

$0.50mole=\frac{w}{22.99g/mole}$

$w=11.4g\approx 11g$

Therefore, the mass of 0.50 moles of Na is, 11 grams