Question

SECTION -DATE DATE EXERCISE 10 Irodno dobro INSTRUCTOR A Moles Show calculation setups and answers for all problems. 1. Find the molar mass of (a) nitric acid, HNO.: (b) potassium bicarbonate, KHCOs, and (c) Nickel(II) nitrate, Ni(NO3)2. H ow to ma Solitana Otoman (b) 2. A sample of mercury(II) bromide, HgBry, weighs 8.65 g. How many moles are in this sample? 3. What is the mass of 0.45 mol of ammonium sulfate, (NH),SO.? 4. How many molecules are contained in 6.53 mol of nitrogen gas, N.? 5. Calculate the percent composition by mass of calcium sulfite, CaSO3- Cu o modulo S

Answer 1

1 a nitric and = HNO3 atomic man of H = MH = 1.0 gimol atomic man of N = MNE 14.0 g/mol atomic man of o= mo = 16.0glmol molar man of HNOJ = MH & MN + 3 X mo 11.0+ 14.0 + 3x 16.0 63.0 g/mol g/mol 6) Potassium bicarbonate = KHCO3 atomic man of KE I mk = 39.0 g/mol atomic mass of H= MH = logImol atomic mass of ca me = 12.0 g/mol atomic man of o= mo = 16.0 gimol, molar man of KHCO3 = mk + MH t mc + 3x mon = 39.0 + 1.0+ 12.0 + 3 x 16.0 l glmol = 100.0 gimol C) Nickel (1) nitrate - Ni(NO3/2 atomic mass of Ni= Mai = 58.7 gimol atomic may of N= MN = 14.0 glmol atomic man of u mo = 16.0 glmol molar mas of Ni(NO3)2 = MNi + 2x MN + 6 x mo = ( 53.7 + 2x14.0 + 6 x 16.0) gimol = 182.6 g/mol