Lowell Chemistry Moles Classwork Problems
[1] How many carbon atoms are in:
[a] 1.03 moles of CO2 gas
[b] 6.71 moles of C5H12 gas
[2] How many moles are:
[a] 3.17 x 1022 atoms of Ne
[b] 65432432432 molecules of CO2
[3] Find the molarity of 10 moles of HCl if its volume is:
[a] 2.5 L
[b] 5.0 L
[c] 7.7 L
[4] Calculate the molar mass of:
[a] C11H22O10
[b] NaHCO3
[5] Find the mass percent composition of each element in:
[a] Na2CO3
[b] CH3COOH
[6] Write the empirical formula of:
[a] C2H4N2
[b] Na2SO4
[7] Convert the following substances from mass to moles:
[a] 99.3 g C2H4N2
[b] 53.3 g Na2SO4
[8] Convert the following substances from moles to mass:
[a] 1.22 mol K2CrO4
[b] 0.233 mol C5H12
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