Question

balance each of the following equations

Fall 209 CHM 105.004 Exam 2 Answer all the question in order in the blue book. Plesse leave at least two lines between question and show your calculations for full credit. N-6.023 x 10” particles per mol: R 0.08.205 L-atm/(mol-K) b) Al2(PO4) 3 e) CuSO4-5 H2O 1. Calculate the molar masses of: a) (NH4)2SO4 2. Calculate: a) the number of atoms of calcium in a 10.50 g sample of the metal b) the mass of 0.215 moles of F2. 3. Classify the following reactions as: a) combination b) decomposition c) precipitation d ) acid-base e) redox f ) combustion i) C(s) + O2(g) → CO2(g) ii) CaCO3(s) → CaO(s) + CO2(g) A HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(1) Ba(NO3)2(aq) + H2SO4(aq) → BaSO4(s) + 2 HNO3(aq) v) CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) lance each of the following equations: a) HNO3(aq) + Ca(OH)2(aq) --------> Ca(NO3)2(aq) + H20 b) N2(g) + H2(8) --------> NH3(g) -) Mg(s) + O2(g) → MgO(s) ler the reaction:

Answer 1

6 HNO3 (99) + CaloM) 2 (aa) ca (103)2(aq) +420 (1) first balance Noz by multiplying 2 in Nez 24 Noz (aa) + calonialaa) CalNon)2 (aq) +420H) • Then balance H by muchplying 2 in 420 2 H Nuzlaq) + Calor/2199 cal103/2laa) + 2H204 6 N2(0)+4219) N 19) Ringt balance N by muutiplying 2 in NM3 Naut Halg) → 2N319) o now Balance it by multiplying 3 in M2 N219) + 3H219) - 2 NEBlg. ② mg/s) + O219) - ingols) Progt balance o by muthplying 2 in mo ingls) + 0219) 2 ingols) Then balance mg by multiplying 2 in nego 2 mg(s) + 0219) - Zingols) balance of 0219) 2 mgols in migo