Answer:
0.073 g
Step-by-step explanation:
To calculate the mass of hydrochloric acid in 50cm³ of a 0.4 mol/dm³ solution, we need to use the formula:
mass = concentration x volume x molar mass
where:
concentration is the concentration of the acid solution in mol/dm³
volume is the volume of the acid solution in dm³
molar mass is the molar mass of hydrochloric acid, which is 36.5 g/mol
First, we need to convert the volume from cm³ to dm³:
50 cm³ = 50/1000 dm³ = 0.05 dm³
Next, we can plug in the values into the formula:
mass = 0.4 mol/dm³ x 0.05 dm³ x 36.5 g/mol
mass = 0.073 g
Therefore, the mass of hydrochloric acid in 50cm³ of a 0.4 mol/dm³ solution is 0.073 g.