A bottle of dilute hydrochloric acid is 2M. What mass of hydrogen chloride, HO, would be discussed in 100cm^3 of this acid?

3.7g in 100 cm^3

7.3g in 100 cm^3

36.7g in 100 cm^3

None of these

Explanation

To find the mass of HCl, we need to calculate the number of moles of HCl in 100 cm^3 (or 0.1 L) of 2M HCl solution, and then multiply it by the molar mass of HCl.

Number of moles = Molarity × Volume (in liters)

= 2 M × 0.1 L

= 0.2 mol

Molar mass of HCl = 36.5 g/mol

Mass of HCl = Number of moles × Molar mass

= 0.2 mol × 36.5 g/mol

= 7.3 g