Question

calculate the number of moles in 5.75gram of sodium

Answer 1

Hello Mate!

Since we know that, number of moles = ( W in g )/( W in g/mol ).

Where W in g stands for weight in gram.

Where W in g/mol stands for weight in gram of 1 mole.

Atomic mass of sodium / Na = 23 g/mol

So, no. of moles we get = 5.75 g / 23 g/mol

= 0.25 moles.

Hence number if moles are 0.25 moles.

Have great future ahead!

Answer 2

Explanation:

We know that,

$\underline{\boxed{\sf Moles = \dfrac{Given\:mass}{molar \:mass}}}$

$\sf Given \: mass \: of \: sodium = 5.75 \: g$

$\sf Molar \: mass \: of \: sodium =23\: g$

$\sf Number \: of \: moles =\dfrac{5.72}{23} = 0.25 \: moles$

Hence the number of moles of sodium is 0.25 moles.