Lowell Chemistry Moles Classwork

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