glycol CH.O, used as a food preservative, (c) para-dichlorobenzene (CaH Clh), us

Question

glycol CH.O, used as a food preservative, (c) para-dichlorobenzene (CaH Clh), used as a moth repellent, and (d) calcium dihydrogen phosphate (Ca(H.POal used as a leavening agent in baked goods and pancake mixes. 4. Calculate the formula mass of (a) sodium azide (NaNb), used in automobile airbags, (b) propyle 5. Calculate the mass, in grams, of (a) 0.o728 mol carbon, (b) 55.5 mol H20, and (c) 0.0728 mol Ca(HSO4) 6. Calculate the amount, in moles, of (a) 3.71 g Fe, (b) 165 g CsHn, and (e) 0.100 g MgNOp.

Explanation / Answer

4)

Formula mass = n1 * atomic mass of atom1 + n2 * atomic mass of atom2 + n3 * atomic mass of atom 3+..........

n1 , n2, n3, ..... = number of respective atoms

a) NaN3 = 1*23 + 3* 14 = 65

b) C3H8O4 = 3*12 + 8 *1 + 4 * 16 = 108

c) C6H4Cl2 = 6*12 + 4*1 + 2 * 35.5 = 147

d) Ca(H2PO4)2 = 1 * 40 +2(2*1 + 1*31 + 4*16) = 234

5)

mass of element = number of moles * molar mass of the compound

a) mass of Carbon = 0.0728 * 12 = 0.8736 g

b) mass of H2O = 55.5 * 18 = 999 g

c) mass of Ca(HSo4)2 = 0.0728 * 234.22 = 17.05 g

6)

number of moles = mass/molar mass of the compound

a) number of moles of Fe = 3.71/56 = 0.06625 moles

b) number of moles of C5H12 = 165/72 = 2.1917 moles

c) number of moles of Mg(NO3)2 = 0.1/148 = 6.757 * 10^-5 moles

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