When you have selected your answer to each question, black pencil. Make a heavy,

Question

When you have selected your answer to each question, black pencil. Make a heavy, full mark, but no stray marks. If you There is only one correct answer to each question. Any quest be counted. Your score is based solely on the number of questions you Benzene, C_6 H_6, reacts with oxygen, O_2, to form CO_2 and H_2 O. How much O_2 is required for the complete combustion of 1.0 mol C_6 H_6? (A) 6.0 mol (B) 7.5 mol (C) 9.0 mol (D) 12 mol A 10.00 g sample of a soluble barium salt is treated with an excess of sodium sulfate to precipitate 11.21 g BaSO_4 (M= 233.4). Which barium salt is it? (A) BaCl_2 (M = 208.2) (B) Ba(O_2 CH)_2 (M = 227.3)

Explanation / Answer

Q1.

mol of C6H6 = 1

the reaction

C6H6 + O2 = CO2 + H2O

C6H6 + 15/2O2 = 6CO2 + 3H2O

then

ratio is 1: 7.5 mol of O"

so

choose B

Q2

m = 10 g of BaSalt

BaSO4 precipitates

mol = mass/MW = 11.21/233.4 = 0.0480 mol of Ba+2

so

mass of Ba = 0.0480*137.327 = 6.591696 g

= 10-6.591696 = 3.408304 g of salt

if

Cl --> 3.408304 / 70.5 = 0.04834 mol of Cl2

0.0480 : 0.04834

this is a good ratio

Ba:2Cl --< BACl2 salt

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