Answer to Question #265791 in General Chemistry for Mel

Question

20.0 g of KHCO3 are dissolved in 350 mL of solution

Answer 1

" Find the molarity of a solution if;

a) 20g of $KHCO_3$ are dissolved in $350ml$ of solution "

Solution

Molar mass of KHCO₃ $=100 .115g/mol$

$20g$ of KHCO₃ $=\frac{20}{100.115}=0.1998moles$

$0.1998$ moles are in $350ml$

in 1000ml, number of moles $=\frac{1000}{350}×0.1998$

$=0.5709$ M