Question

48gm of CH4 is dissolved in 50gm of water find molality​

Answer 1

Molar mass of solute:-

$\\ \sf\longmapsto CH_4$

$\\ \sf\longmapsto 12u+4(1u)$

$\\ \sf\longmapsto 12u+4u$

$\\ \sf\longmapsto 16u$

$\\ \sf\longmapsto 16g/mol$

• Given mass=48g

$\boxed{\sf No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}}$

$\\ \sf\longmapsto No\:of\:moles=\dfrac{48}{16}$

$\\ \sf\longmapsto No\:of\:moles=4mol$

• Mass of solvent=50g

We know

$\boxed{\sf Molality(m)=\dfrac{Moles\:of\:Solute}{Wt\:of\:solvent\:in\:g}\times 1000}$

$\\ \sf\longmapsto m=\dfrac{16}{50}\times 1000$

$\\ \sf\longmapsto m=0.32\times 1000$

$\\ \sf\longmapsto m=320$