A bottle of dilute hydrochloric acid is 2M. What mass of hydrogen chloride, HO, would be discussed in 100cm^3 of this acid?
Answer: 7.3g in 100 cm^3
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
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