Answer:
A) 100 mL
Explanation:
At constant temperature and number of moles, Using Boyle's law
Given ,
V₁ = 200 mL
V₂ = ?
P₁ = 60 kPa
P₂ = 120 kPa
Using above equation as:

Explanation:
magnesium Hydroxide + Hydrochloric react together and give us magnesium chloride + water
mass (m) = ? , volume = 18.0 ml , density = 1.42 g/ml .

I hope I helped you^_^