7 What is the relative formula mass, M6 of magnesium chlorate Mg(ClO3)2 ? a) 215.52 b) 107.76 c) 191.21 d) 143.21 e) 333.01 8 Octane burns in oxygen according to the following equation: 2C8H18+25O216CO2+18H2O What mass of water will be produced when 3 mol of octane burns, expressed to two decimal places? a) 486.54g b) 973.08g c) 27.00g d) 6.01g e) 324.36g 9 A digital thermometer displays temperatures in 0.1C increments. The instrument error associated with readings from this device will be which one of the following? a) 0.005C b) 0.5C c) 0.1C d) 0.01C e) 0.05C