148.0cm³ of Hydrogen (corrected to s. t.p) were released by dissolving 0.16g of magnesium in hydrochloric acid. Given that 1dm³ of Hydrogen as s. t.p weigh 0.09g, calculate the mass of magnesium which will display 2.09g of Hydrogen.

)in the deacon process for the manufacture of chlorine, hcl and o2 react to form cl2 and h2o. sufficient air (21 mole% o2, 79% n2) is fed to provide 35% excess oxygen, and the fractional conversion of hcl is 85%. calculate the mole fractions of the product stream components.