Question

12) What is the sum of the cofficients when the following equation is balianced using the lowest whole-numbered coefficients? H20(gl A) 10 B) 12 C) 19 D) 22 13) Which contains Avogadro's number of formula units? A) 36.5 g of a 8) 36.5 g of Ch C) 36.5 g of H of these 14) What is the molar mass of aspartic acid, C404H7N? 70 g/mol gm)1g/mol A) 43 g/mol S) A compound responsible for the odor ofgarlic has a molecular weight of 73?mol. A O 650 B sample of the compound contains 0.321 g of carbon, 0.044 g of hydrogen, and 0.285 g of sulfur. What is the molecular formula of the compound? C3H1553 16) The following diagrams represent the reaction of Az (shaded spheres) with 82 (unshaded spheres), Identify the limiting reactant and write a balanced equation for the reaction A) Az is the limiting reactant, A3AB3 B) A2 is the limiting reactant A2+3 B22 AB3 C) 82 is the limiting reactant A+3B+AB3 D)82 is the limiting reactant; A2+3 B22 AB3. 17) How many grams of calcium chloride are needed to produce 10.0g of potassium chloride? Molar masses:- CaCla 111.0g/mol and -74.5 g/mol A) 0.134 g 8) 7.44 g C)9.28 g D)18.56 g Chapter 4 Reactions in Aqueous Solutions 4 Questions 18) Write a balanced net ionic equation for the reaction of Pb[NO3)2loq) with Nalaq). A)Pb(NO3)21aq) + 2 Nal(oq) ? Pbl2(s) + 2 NaNO3(aq) 19) What is the molar concentration of sodium ions in a 0.350 M Na3PO4 solution? [Molar masses; Na 23, P 31 and O 16/mol 17 M B) 0.350 NM C)1.05M D) 1.40 M 20) When dissolved in water, LUOH behaves as A) an acid that forms Li+ and OH- ions. B) an acid that forms LiO- and Ht ions a base that forms Li+ and OH- ions. D) a base that forms LiO- and Ht ions. 1) The reaction 2 HNO3laq)+ Ba(OH)2(aq)Ba(NO3)z/aq)+2 H20() is best classified as a(n) acid-base neutralization reaction. B) oxidation-reduction reaction. ation reaction. Dj single replacement reaction.

Answer 1

Ans 12 : c) 19

To balance the chemical reaction ,start by identifying the elements on each side of the reaction. Then balance the elements on left to the ones on the right.

So the balanced reaction is given as :

4PH3 + 8O2 = P4O10 + 6H2O

The sum of coefficients = 4 + 8 + 1 + 6

= 19