Question

I was wondering if someone could help me with some problems on my test, my teacher allows me to correct them then give them back for 1/2 credit. Along with the correct answer for each I'd like to know why the answers are wrong and why the new answer is correct. The questions with a red mark are the incorrect ones.

12 An unknown hydrocarbon compound (containing only hyd own hydrocarbon compound (containing only hydrogen and carbon) was analyzed for y elemental analysis and results show that it contains 15.88% H and a molar mass of 171 g/mol. What is the molecular formula? a. C.H b. CxHs c. C12H27 d. CisH₂ (c. Cotis 13. When the equation Ca(OH)2 + HPO-7 Ca(PO) + HO is properly balanced, what is the sum of the coefficients? a. 8 or less 6.9 c. 10 d. 11 e. 12 or more 3+2+1 +6=12 14. Which of the following are empirical formulas? i. CoHg ii. CH iii. Al Clo iv. NO2 v. Hg.Cl2 a. i only b. i and ii (c. ii and iv d. i, ii, and v e. iii, iv, and v 15. How much silver nitrate must be measured to yield 1.00 g silver? a. 1.00 g b. 1.57 g c. 1.70 g a 2.00g e. 0.635 g

Answer 1

Salb (lay the compound contains 65.88% * __ with_malasmage 2L- __80, 00gs of Hdgogen_in--15-880- 100 - the compound 27 gm. 30 among the options only Cataz is halling or gm Hydragen and 17 gm molar mass so. w Answer-c (13) Balanced Chemical equations 3 calowa +243 Pou o traslloub+6120. Checking fouf the een is balanced. The elements on both side should be 29

LUS RKS. ca pou (other than lo pou 1. e b. i balored. Sum of coefficients = 3+2+1+6 = 13. Answer = e LuEmpigical formula is a formula giere elements in simplest form. ie the no. of atoms of the elements should be in simplest farm. So, W cong emphical formula (sy (ii) cka - empirical formula: CH2 ( Alzcla - Empisical formula Alca 1 (iv) Noo empirical farmula: No. 1 (u) Haada - empisical Formula regel. 1 Sou_The compounds which are empllica' te formula. are. ü andling So i Jong & c

Its) Agnoz to Ag. The conversion Goog — 9ough - @ Agnozu -> OA9S) +. 0269 +2 NORG) Here we can see that a male of Agnoz react to form a male Ag. So, for tgn ng - Molar mass of Ag то48 of AgNo3 molar mass of AgNO3. a mass of Agnoz: 170 f152 Lama 108 4 SOY Answer: B
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