Raoult’s Law Question 5
Aspirin is very soluble in ether. If 0.372g of aspirin are dissolved in 2.97g of diethyl ether, the vapor pressure of the ether lowers from 0.631 to 0.601 atm at…
Kinetic molecular theory and states of matter
States of Matter There are three different states of matter: solids, liquids and gases. These three states of matter behave differently in space: Solids have got a both a fixed…
Moles VIII – Redox Titrations
Question 1 Balance the following equations in acidic conditions: As2O3+ NO3- à H3AsO4 + N2O3 MnO4- + S2O32- à Mn2++ SO42- H2O2+ Cr2O72¯ àCr3+ + O2 + H2O IO3- + SO2 à I2…
Moles VII – Back Titrations
Question 1 Some pure magnesium carbonate was added to 145. mL of 1.00 M HCl. When the reaction had finished, the solution was acidic. 25.0 mL of 0.500 M Na2CO3 solution…
Moles VI – Titrations
Question 1 A solution of sodium hydroxide contained 0.250 mol dm-3. Using phenolphthalein indicator, titration of 25.0 cm3 of this solution required 22.5 cm3 of a hydrochloric acid solution for complete neutralisation.…
Moles V – Gas Laws
Question 1 Calculate the volume occupied by one mole of a gas at 25 oC and 100 kPa. Question 2 Calculate the pressure of a gas given that…
Moles IV – Concentrations
Question 1 Calculate the number of moles of H2SO4 in 50 cm3 of a 0.50 moldm-3 solution. Question 2 Calculate the number of moles of FeSO4 in 25 cm3…
Moles III – Empirical Formulae
Question 1 What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass? Question 2 A compound is found to contain 23.3% magnesium, 30.7% sulfur,…
Moles II – Stoichiometry
Question 1 Given the chemical equation Na(s) + H2O(ℓ) → NaOH(aq) + H2(g) a) Balance the equation. b) How many molecules of H2are produced when 332 atoms of Na react? Question 2…
Moles I – Introduction
Question 1 How many atoms are present in 4.55 mol of Fe? How many atoms are present in 0.0665 mol of K? How many molecules are present in 2.509 mol…