1、Exercise1.1 Relative massAl2O3 K2Cr2O7 H2SO4 HNO3HF CO32-CuSO4 NH4+Fe3O4 P2O51.2 Mole and the Avogadro constant1.How many of atoms are contained in 5.6g of iron?2.How many iron are there in 0.1 mole iron?3.How many of 121023 molecules of H2?4.How many are there in 2 moles H2?5.Calculate the of 0.2 m
2、ole of gas at s.t.p.6.Calculate the of 13.44 dm3 of gas at s.t.p.Calculate the and of 241023 molecules of NH3 at s.t.p.Ethanol has molecular formula C2H5OH.A sample of ethanol has a mass of 2.3 g.(1)are present?(2)How many are present?(3)How many are present?(4)How many are present?(5)Write down a b
3、alanced equation for the combustion.(6)How many were produced in the combustion?(7)What of the was produced?(8)How many were used up?(a)Use the value of the Avogadro constant to calculate the total number of atoms in 7.10g of chlorine atoms.(b)Calculate the amount in moles of nitric acid,HNO3,in 25c
4、m3 of a 0.1 mol dm-3 aqueous solution.(c)Calculate the concentration in mol dm-3 of sodium hydroxide,NaOH,if 250 cm3 of a solution contains 2.0g of NaOH.(d)What is the concentration in mol dm-3 of an aqueous solution containing 4.00g dm-3 of sodium hydroxide,NaOH?(e)Calculate the volume,in dm3,occup
5、ied by 26.4g of carbon dioxide at room temperature and pressure.Given that at room temperature and pressure,1 mole of any gas occupies a volume of 24 dm3.Which of these samples has the largest mass?A.2.24 dm3 of ethane,C2H6.B.3.61022 molecules of O2.C.672 cm3 of carbon dioxide CO2.D.0.05 mole of hyd
6、rogen fluoride,HF.1.An organic compound has the following percentage composition by mass:40of carbon,53.33of oxygen and 6.67of hydrogen.The relative molecular mass of the compound is 180.Find the empirical formula and the molecular formula of the compound.Deduced the formula of the hydrocarbon and find the relative molecular mass of the hydrocarbon.1.How many atoms are present in 8.8g of carbon dioxide,CO2?2.Calculate the number of atoms of 8g methane,CH4.3.Calculate the number of atoms of 15.6g of benzene,C6H6.4.Calculate the number of atoms of 21.8g of bromoethane,C2H5Br.
