Term 1 Revision Unit 1

What is the empirical formula for the compound formed from 40.1% Calcium (Ca) and 59.9% Fluorine (F) by mass?

• CaF

• CaF2

• Ca2F

• Ca2F2

What is the empirical formula for the compound formed from 52.2% Magnesium (Mg) and 47.8% Oxygen (O) by mass?

• MgO

• MgO2

• Mg2O

• Mg2O2

How many moles of carbon dioxide (CO2) are produced when 1 mole of butane (C4H10) is completely combusted in excess oxygen? 2C4H10 + 13O2 → 8CO2 + 10H2O.

• 4

• 8

• 10

• 13

How many moles of water (H2O) are produced when 2 moles of octane (C8H18) are completely combusted in excess oxygen? 2C8H18 + 25O2 → 16CO2 + 18H2O.

• 8

• 16

• 18

• 25

A 150.0g sample of an unknown compound was found to contain 30.08g of Magnesium, 40.02g of Sulfur, and the remainder was Oxygen. Calculate the empirical formula of the compound.

• Mg S O4

• Mg3 S4 O8

• Mg2 S O8

• Mg3 S2 O4

A 120.0g sample of a mysterious compound was discovered to contain 48.0g of Aluminum, 28.0g of Nitrogen, and the remainder was Oxygen. Calculate the empirical formula of the compound.

Given the reaction equation below, identify the product formed when barium chloride reacts with sulfuric acid. BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq) If 25.0 g of barium chloride and 30.0 g of sulfuric acid are used, which reactant is the limiting reagent?

How many moles of potassium chloride (KCl) are present in 149 g of KCl dissolved in 200 g of water (H2O)?

What is the energy change when 2 mols of NaCl are dissolved in ethanol if the energy released per mol is 25 kJ mol^-1?

Given a temperature increase of 50 K in ethanol, determine the specific heat capacity of ethanol in J g^-1 K^-1.