Practice Problems 29. Zinc chloride (Zncl) is used in soldering flux, an alloy u

Question

Practice Problems 29. Zinc chloride (Zncl) is used in soldering flux, an alloy used to join metals together. Determine the moles of Cl ions in 2.50 mol ZnCl2. 30. Plants and animals depend on glucose (CeH12Oe) as an energy source. Calculate the number of moles of each element in 1.25 mol CGH12Oe. 31. ron (Ill) sulfate [Fez (SO)al is sometimes used in the water purification process. Determine the number of moles of sulfate ions present in 3.00 mol of Fez (SO)3. 32. How many moles of oxygen atoms are present in 5.00 mol of diphosphorus pentoxide (PO)?

Explanation / Answer

29)

1 mol of ZnCl2 have 2 mol of Cl-

So,

mol of Cl- = mol of ZnCl2 * 2

= 2.50 mol * 2

= 5.00 mol

Answer: 5.00 mol

30)

number of moles of C = 6*number of moles of C6H12O6

= 6*1.25

= 7.50 mol

number of moles of H = 12*number of moles of C6H12O6

= 12*1.25

= 15.0 mol

number of moles of O = 6*number of moles of C6H12O6

= 6*1.25

= 7.50 mol

I am allowed to answer only 1 question at a time

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