Question

problem set 7: questions 1-5

INTRODUCTION TO CHEMISTRY (Problem set 77 1. Balance the following reactions by adjusting the coefficients. Then identify which class of reaction, Synthesis single replacement, decomposition, double replacement de composition, double replacement or oxidation, each belongs to a) Cal . HOn - Ca(OH). Hall b) NO. O NO All(OH) - N06 HOM Fes) + H,SO. — Fe (SO4). He e) Alm . Br - AlBryte 2. Explain why the interpretation that 1.0 gram of carbon (C) reacts with 10 gam of oxygen (O) by the following reaction is incorrect CI) + ) CO, 3. Identify whether the following statements are true or false For the reaction: Mg(OH)2 + 2 HC 2 H2O + MgCl, (a) 0.10 moles of Mg(OH), reacts with 0.20 moles of HCI 58.3 grams of Mg(OH), reacts completely with 36.5 grams of HCI What is the limiting reagent when 1.25 moles of N, and 50.0 grams 4. For the reaction: N, a + 2 0, (g) 2 NO, of O, are combined? Show your work.

Answer 1

a) ca Hq + H2O + Ca(OH)2 + H2 It is single replacement reaction Balanced equation is: Cat₂ + 2H₂O → Calottly + 2H2 c) NO + Oz > NO Balanced equation je 2N0 + O2 + 2NOZ It is synthesis reaction, Allohg 4, Al2O3 + H2O It is de composition reaction, 2 Al(OH)3 e 2 Aboz + 3H20 2 Alloh s Al2O3 + 3H2O do Fe + H₂SO4 → resoy + H₂ It is single replaceuse at reaction It is balanced esuation, Al + Br2 Al Br3 2 Al + 3 Br2 2 Al BV ₂ It is synthesis reaction

C + O2 CO2 Imole of Carbar → Imole of or it required 12s of Carbon 32 g oto₂ is required moles of carbon and oxygen escal not weights reacted, 19 of carbon ? but oto2 required, 19 Сам — тво) oxyge is interpretation is wrong. Mg(OH2 + 2HU → Mgu2 + 2H2O a Imole of mg (OH)2 zude of Hefresuired on mole of Mg(OH)2 →? 0.2 mole of the resuired It is Tree

Imole of Mg(OH)2 zwole of He resuined 58-3 9 of Mg(OH)2 -> 2x 36:59 0HCl required 58-39 of mgloh)2 = 73 9 67 HU. required a statement is false 4 N2 + 202 → 2N02 Imole of Nz 2 mole of Oz resuired Irole of Na (2x32) g of Or resuired 1. 25 mole of N2 » mass of O2 rescuined = 1+25 x64 = 80s But so s of Oz is only present Than required O2 is present less. > O2 is lineiting reagent.

5 SiO2 + c co + sic Sio, + 30 -> 200 + Sic C Balanced equation, mase of imole of sio₂ = 1X atauic mass of sit 2x atauic mass of oxygen 'X 28 + 2x16 - 60 g/mol, 1.000 9 of sion no otwoles = mass Molar mase = 1.00 o mole - 0.0167 mole I mole - of sio, » Imole of Sic made 0.0167 mole otsion ?? no ot moles otsis made = 0.0167 e mase of sic rucol = 0.0167740)9 = 0.6689