Question

Need help slolving questions 1-6 please!

Mass A Moles A Moles B Mass B Molar mass A Molar mass B Ratio from balanced equation 1. How many moles of H2 can be made from complete reaction of 3.0 moles of AI? (5 pts) Given: 2 Al(s) + 6 HCl(aq)-2 AICI, (aq) + 3 H2(aq) 2. How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? (10 pts) Given the reaction: 2H,(8) +0,(8) 2.0(g) 3. The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield? (5 pts) 4. How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3),? (5 pts) Reaction: 3Ca(NO),(aq)+ 2Li,PO,(aq) - LINO, (aq) + Ca,(PO)() 5. How many grams of calcium phosphate are theoretically produced if we start with 2.40 moles of Li,PO,? (10 pts) Reaction: 3Ca(NO),(aq)+ 2Li,PO, (aq) - LINO, (aq) + Ca,(PO)() 6. If in reaction 5 above you obtained an actual yield of 253 g, what is the % yield? (5 pr.)

Answer 1

oll Ghu cag) 2Al(s) + 2 Alu (aq) + 3H₂ (2) produce a mole Aluz and 3 Al will 2 mole of mole of H2 the = 3x MAI = 2 x 3 = 4.5 2H₂ (9) + O₂(g) → 2H₂O (9) tway , , - чЯm. moles of H₂ - 4 = 2 (molar mass H₂ = 294) moles of H₂0 produced - 2 x H2 = 1 X 2 = 2 2 eweight of H₂O = 2x Molar mass H₂O = 2x 18 = 36 gm. = 42 x 100 % Yield = Actual Yield x 100 Theoretical Yield 1% Yild = 56% |

3 Ca(NO3)2 + 24₂ pou - GLINO3 + Caz (Pou), 3 moles of moles of Ca(NO3)2 Ling gives 6 moks of LiNO, produced = 6 x MeaNO3)2 = In Lingz = 2x3.4 = 6.8 os 3 moles of Ca(NO3), reacts with 2 moles of Liz Pou to give 6 moles of Ling, and more of Cas(pou) moles of caz pou produced = tx moes Liz Poy molar mass of weight of = ₂ x 2.4 = 1.2 Ca₂ (P0u = 310 gmimol caz (PO4) Produced = moly x molar mass = 1.2 x 310 = 372 guns. acheal Yield = 253 gm. % Tield = 253 x 100 = 68% 372