week 6 term 3 grade 11 sabis quiz 3

The molar mass of a salt, given that 25 cm³ of a 0.40 M solution left a residue of 1.11 g after evaporation, is ____ g/mol (to three significant figures).

A lab technician is asked to prepare 500 cm³ of a 0.50 M H₂SO₄ solution from a 6.0 M H₂SO₄ stock. The volume of the stock solution needed is ____ mL (to three significant figures).

The concentration of Cl⁻ ions present in a mixture of 25 cm³ of 0.20 M NaCl solution and 75 cm³ of 0.020 M CaCl₂ solution is ____ M (to two significant figures).

The % yield of the reaction between 9.0 g of H₂ and 2.0 mol of N₂, producing 20.4 g of NH₃, is ____%.

The pressure in a container after the complete combustion of a mixture containing 0.50 mol of CH₄ and 1.0 mol of O₂ at 25°C and 1.0 atm, is ____ atm.

The formula of the compound formed when 0.78 g of potassium reacts with excess oxygen to produce a product with a mass of 1.1 g is ____.

The empirical formula of a hydrocarbon that produced 0.324 g of H₂O when 0.198 g of it was burned in excess Oxygen is ____.

The empirical formula of a compound that is 52.18% C by mass, 13.04% H, and 34.78% O is ____.

The value of x in CuSO₄.xH₂O is ____. (DOK Level 2)

The percent abundance of ⁷Li in naturally occurring lithium, given the average atomic mass of lithium is 6.9, is ____%. (DOK Level 2)