Question

in a mixture od Nacl and water, 25kg of Nacl dissolve in75 kg og water. fond the compostion in wt% and mole%​

Answer 1

Answer:

Weight % = 25% , mole% = 10.2%

Explanation:

weight% = $\frac{weight of substance}{weight of solution}$ × 100

⇒ weight% =  $\frac{25}{25+75}$ × 100

⇒ weight% =  $\frac{25}{100}$ × 100 = 25%

mole percentage = $\frac{mole of substance}{mole of solution}$ × 100

Now, moles of NaCl = 25 × 10³ ÷ 58.5 ≈ 427 mol

moles of Water = 75 × 10³ ÷ 18 ≈ 4166 mol

⇒ mol% = $\frac{427}{427+4166}$ × 100

⇒ mol% = $\frac{427}{4593}$ × 100 = 9.29%