Calculate the molar mass of CuSO4 · 5H2O. Hydrated ionic compounds are ionic com

Question

Calculate the molar mass of CuSO4 · 5H2O. Hydrated ionic compounds are ionic compounds with the stated number of water molecules included into the interstitial sites of the ionic lattice. In hydrated compounds, a specific number of water molecules becomes part of the lattice, as a result you must account for the indicated molecules of water in calculating the chemical formula.

2. How many moles are in 1.5 grams of CuSO4 · 5H2O? 3. How many moles of ammonia are present in 5 mL of a 15 M NH3 solution?

.3. How many moles of ammonia are present in 5 mL of a 15 M NH3 solution?

Explanation / Answer

63.55 (Cu) + 32.07 (S) + 4 × 16.00 (O) + 5 × [2 × 1.01 (H) + 16.00 (O)]
= 249.72 g mol.

CuSO4 · 5H2O = 63.55 *1 + 32*1+4*16+ 5*[2*1 +16*1 ] = 249.72g/mole

no of moles of CuSO4 · 5H2O = weight of CuSO4 · 5H2O/G.M.Wt of CuSO4 · 5H2O

                                                     = 1.5/249.72 = 0.006 moles

3. no of moles of NH3 = molarity * volume in L

                                     = 15*0.005 = 0.075 moles

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