Name___________________
Period__________________
Chemistry Quiz
Fill in the blanks below.
1 mole of x = ______________________representative particles of x
1 mole of x = ______________________ g of x
1 mole of CuSO4 = _________________________ formula units of CuSO4
1 mole of CuSO4 = _________________________g of CuSO4
Find the molar mass of the following compounds. Make sure you give the units.
1) P2S5_________________________
5) KNO2_____________________
2) hydrofluoric acid _______________
6) sodium oxalate ___________
3) NaBr__________________________
7) AlCl3 _____________________
4) CaSO3 _______________________
8) LiClO4 _____________________
Problems. You must show your work for credit.
1) How many atoms are in 7.4 moles of iron ?
2) How many moles are in 8.54 X 1024 molecules of carbon tetrachloride ?
3) How many moles are in 4.3 x 104 grams of KNO3 ?
4) How many grams are in 8.54 X 1021 atoms of strontium ?
5) How many grams are in 4.42 moles of sodium chloride ?
5) How many grams are in 4.21 X 10 27 formula units of Ca(NO3)2 ?
6) Find the percent composition for each element in the following.
Fe2O3
%Fe____________
%O_____________
KClO3
%K______________
%Cl______________
%O_______________
Cu(NO3)2
%Cu______________
%N_______________
%O_______________
7) Find the empirical formula of a compound that is 28.2 % N, 8.1 % H, 20.8 % P, and 42.9 % O.
6)
8) Find the molecular formula of a substance that is 43.64 % phosphorus and 56.36 % oxygen by mass and has
a molecular mass of 283.88 g/ mole.
7)