Moles: Mole and Formula Units

Topics: Mole, Magnesium, Carbon dioxide Pages: 2 (330 words) Published: March 1, 2013
***ANSWERS***
CP Chemistry
Mole Review Practice Problems

Find the mass of 0.89 mol of calcium chloride.
0.89mol x 111 g / 1 mol = 98.8 g
Determine the number of moles of C5H12 that are in 362.8g of the compound. 362.8g x 1 mol / 72 g = 5.04 mol
Find the mass of 0.159 mol of silicon dioxide.
0.159 mol x 60 g / 1 mol = 9.54 g
You are given 12.35 g of C4H8O2. How many moles of the compound do you have? 12.35 g x 1 mol / 88 g = 0.140 mol
Find the mass of 3.66 mol of nitrogen.
3.66 mol x 28 g / 1 mol = 102.5 g
Determine the number of atoms that are in 0.58 mol of Se. 0.58 mol x 6.02 x 1023 atoms / 1 mol = 3.49 x 1023 atoms How many moles of barium nitrate contain 6.80 x 1024 formula units? 6.80 x 1024 formula units x 1 mol / 6.02 x 1023 formula units = 1.13 x 101

CP Chemistry
Test Review (Unit 10)

Complete the following reactions, balance the equations and identify the type of reaction. For single and double replacement reactions indicate whether or not the reaction could actually occur (if not, note why not).

1.2Al + 3Cl2 ---> 2AlCl3 comb.; yes rxn
2.NH4Cl + NaC2H3O2 ---> NH4C2H3O2 + NaCl d.r.,no rxn, all soluble 3.2PbO2 ---> 2PbO + O2 dec.; yes rxn
4.2AlBr3 + 3Ba(OH)2 ---> 2Al(OH)3 + 3BaBr2 d.r., yes rxn
5.Iron III iodide + 3silver bromide ---> FeBr3 + 3AgI d.r., yes rxn 6.2LiCl + I2 ---> 2LiI + Cl2 s.r, no rxn, I not replace Cl
7.4K + O2 ---> 2K2O comb.
8.MgCO3 ---> MgO + CO2 dec.; yes rxn
92AlCl3 + 3MgCO3 ----> Al2(CO3)3 + 3MgCl2 d.r.,no rxn, MgCO3 insol. 10.Zn + H2SO4 ---> ZnSO4 + H2 s.r., yes rxn
11.Mg + 2AgNO3 ---> Mg(NO3)2 + 2Ag s.r., yes rxn
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