Answer all the question sin order in the blue book. You must show your calculati

Question

Answer all the question sin order in the blue book. You must show your calculations for ful credit. N 6.023 x 102 particles per mol; R-0.08205 L atm/(mok K) 1. Calculate: a. the molecular and molar masses of: (i) NH () S,Cl b, the formula and molar masses of: (i) Nasso. (ii) BaCl2·2H2O 2. Calculate: (a) the mol of potassium in a 8.3455 g sample of the substance .35sgk x Imol K 0- (b) the mas of 0.375 mol sample ofoxyggf- as 0.3 5normpeo-1000g 02 3. Classify the followving reactions as a) nthesis b)deompostio e precipitation d'acid-base e) redox f)combustionCM+82 CO 2+H10 ii) iii) iv) S(s) +02(g)2SO2(g) Sunnes ii) CuCO3(s) CuO(s) + CO2(g) decompos) HCI(aq) + N0H(aq) NaCl(aq) +H20(l)aCvCl-base Pb(NO3)2(aq) + 2 HCI(aq) PbClds) + 2 HNOs(aq) (COX CH4(g) + O2(g) CO2(g) + 2H20(g) Como Ston Balance each of the following equations: (a) H2S04 (aq) + 2kOH (aq)--> K2SO4 (aq) + 2120 () (c) Na2Co3 (a)+2HCI (ag) NacI(ag)+Co2gH20 Consider the reaction: 4. 5. Ca(OH)2(aq) + 2 HCI(aq) CaCb(aq) + 2H20(1) How many grams of HCI are required to react with exactly 8.000 g of Ca(OH)2?

Explanation / Answer

Q1.

a)

molar mass of NH3

Molar mass = MM of N + 3x(MM of H) = 14 + 3*1 = 17 g/mol

Molar mass of S2Cl2 = 2xMW of S + 2xMW of Cl = 2*32 +2*35.5 = 135 g/mol

b)

Formula and molar masses:

Na2SO4 --> 2NA + S + 4O = 2*23 + 32 + 4*16 = 142 g/mol

BaCl2*H2O --> Ba + 2Cl + 4H + 2O = 137.327 + 2*35.5 + 4*1 + 2*16 =244.3 g/mol

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