2.54g of sodium chloride were dissolved in water and the solution made up to 100cm cube. What is the concentration of the solution in mole per decimeter cube?

Answer 1

First, we need to find the number of moles of sodium chloride (NaCl) present in 2.54 grams.

Molar mass of NaCl = 58.44 g/mol (23g for sodium + 35.44g for chlorine)

Number of moles = mass / molar mass
Number of moles = 2.54 g / 58.44 g/mol = 0.0435 mol (rounded to 4 decimal places)

Now, we need to find the volume of the solution in cubic decimeters (dm³).

Given that the solution was made up to 100 cm³, we have:

1 dm³ = 1000 cm³
100 cm³ = 0.1 dm³

Now, we can find the concentration in moles per cubic decimeter (mol/dm³):

Concentration = number of moles / volume
Concentration = 0.0435 mol / 0.1 dm³ = 0.435 mol/dm³

So, the concentration of the solution is 0.435 mol/dm³.