Question

3.42g of a substance of molecular weight of 342 present in 250g of water to find molarity

Answer 1

Answer:

0.04M

Explanation:

density water=1000g/L

mass if water=250g

d=m/v

v=m/d=250/1000L

so 3.42 g of the subtance is in water so it is a

solution

moles of substance=mass/gram molecular mass

gram molecular mass =molecular mass represented in grams so gram molecular mass if the substance =342g

so moles=3.42/342=0.01mol

molarity=moles/volume=0.01/250/1000

=1000×0.01/250=10/250=1/25=0.04M