Question

Aspoon of table salt, Naclcontains 12.5g of this salt calculate the number of moles?​

Answer 1

Answer:

$\bigstar{\bold{Number\:of\:moles\:of\:NaCl=\:0.21\:moles}}$

Explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Mass of NaCl = 12.5 g

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Number of moles of NaCl

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ Molar mass of NaCl = 23 + 35.5 = 58.5

→ Number of moles of NaCl = Given mass/Molar mass

→ Substituting the given datas we get,

  Number of moles of NaCl = 12.5/58.5

$\boxed{\bold{Number\:of\:moles=\:0.21\:moles}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

→ The number of moles of any substance is given by the formula

Number of moles = Given mass of substance/Molar mass

Answer 2

Answer:

Mass of NaCl= 12.5g

Molar mass of NaCl= 23+35.5=58.5g

Number of moles=Total mass ÷ molar mass

=12.5÷58.5

→0.21 moles