Question

John finds the mass of his stacked coffee cups (including the stir bar) to be 12.05 g. He adds 43.32 mL of deionized water (assume the density = 1.00 g/mL) to the coffee cup device, followed by 5.04 g of potassium nitrate (KNO3) to the coffee cup calorimeter device. The total mass of his solution is ________ g

Answer 1

density = mass/volume

mass = density*volume

mass of water = density of water * volume of water

                       = 1.00 g/mL*43.32

                       = 43.32 g

mass of KNO3 = 5.04 g

Total mass of the solution = mass of water + mass of KNO3

                                         = 43.32 + 5.04

                                         = 48.36 g