s pointsZumintro6 8 P.051 For each of the following samples of ionic substances,

Question

s pointsZumintro6 8 P.051 For each of the following samples of ionic substances, calcu positive lons present in each sample. the number of moles and mass of the late (a) 4.42 g of ammonium iodide, NH41 mol (b) 6.16 mol of ammonium sulfide, (NH4)25 mol (c) 9.71 g of barium phosphide, Ba3P2 mol (d) 7.86 mol of calcium phosphate, Cas(POa)2 mol - 10.-/18 pointsZumintro6 8.P.085. Complete the following table. mass of sample moles of sample molecules in sample atoms in sample ] g | 12 [ ] ] mol 2.57 x 1022 molecules CO2 1.10 mol HCI g rer -mol | 4.44 x 1024 molecules H20 |

Explanation / Answer

a) 4.4 g of NH4I

moles of NH4I = mass/ molar mass =4.4/145 =0.03034 mol

moles of NH4+ = 0.03034

and its mass = moles x formula mass

= 0.03034 x 18 g/formula

= 0.5462 g

b) 6.16 mol of (NH4)2S

moles = 6.16g /68g/mol =0.0905 mol

moles of NH4+ = 2 x0.0905 mol

mass of NH4+ = 2x 0.0905 x18g

= 3.26 g

c)9.71g of Ba3P2

moles = 9.71/ 474.2 =0.02047 mol

moles of Ba+2 = 3 x 0.02047 =0.06143

mass of Ba+2 = 3x0.02047x 137.4g

= 8.44g

d)7.86 moles of Ca3(PO4)2

moles of Ca+2 = 3 x 7.86 =23.58 mol

mass of Ca+2 = 3x7.86x 40 g

=943.2 g

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