Solve each of the following. Complete for homework. 1. Determine the mass is 1.9

Question

Solve each of the following. Complete for homework.   
1. Determine the mass is 1.9 x 10^21 atoms of diatomic bromine. Solve below or on the reverse side of this page. 2. A compound was found to contain 2.92 g. of carbon, 1.94 g. of oxygen, and 0.49 g. of hydrogen. The molecular weight or the gram formula mass of the compound was found to be 176. What is the empirical and molecular formula of this compound? Solve below or on the reverse side of this page.
3. Balance the following three reactions: Sodium reacts with water _______________________________________________________________________ Lithium hydroxide reacts with sulfuric acid Silver nitrate reacts with barium chloride ______________________________________________ Solve each of the following. Complete for homework.   
1. Determine the mass is 1.9 x 10^21 atoms of diatomic bromine. Solve below or on the reverse side of this page. 2. A compound was found to contain 2.92 g. of carbon, 1.94 g. of oxygen, and 0.49 g. of hydrogen. The molecular weight or the gram formula mass of the compound was found to be 176. What is the empirical and molecular formula of this compound? Solve below or on the reverse side of this page.
3. Balance the following three reactions: Sodium reacts with water _______________________________________________________________________ Lithium hydroxide reacts with sulfuric acid Silver nitrate reacts with barium chloride ______________________________________________ Solve each of the following. Complete for homework.   
1. Determine the mass is 1.9 x 10^21 atoms of diatomic bromine. Solve below or on the reverse side of this page. 2. A compound was found to contain 2.92 g. of carbon, 1.94 g. of oxygen, and 0.49 g. of hydrogen. The molecular weight or the gram formula mass of the compound was found to be 176. What is the empirical and molecular formula of this compound? Solve below or on the reverse side of this page.
3. Balance the following three reactions: Sodium reacts with water _______________________________________________________________________ Lithium hydroxide reacts with sulfuric acid Silver nitrate reacts with barium chloride ______________________________________________ Solve each of the following. Complete for homework.   
1. Determine the mass is 1.9 x 10^21 atoms of diatomic bromine. Solve below or on the reverse side of this page. 2. A compound was found to contain 2.92 g. of carbon, 1.94 g. of oxygen, and 0.49 g. of hydrogen. The molecular weight or the gram formula mass of the compound was found to be 176. What is the empirical and molecular formula of this compound? Solve below or on the reverse side of this page.
3. Balance the following three reactions: Sodium reacts with water _______________________________________________________________________ Lithium hydroxide reacts with sulfuric acid Silver nitrate reacts with barium chloride ______________________________________________

Explanation / Answer

1.

2 atoms of Br2 = 1 molecule of Br2

1.9 x 10^21 atoms of diatomic bromine, Br2 = 1.9*10^21/2 = 0.95*10^21 molecules of Br2

6.02*10^23 molecules = 1 mol

0.95*10^21 = 0.95*10^21/(6.02*10^23) = 0.0016mol

Molecular mass of bromine Br2 = 159.8

Mass of 0.0016mol = 159.8*0.0016 = 0.252gm

  

2.

2.92 g. of carbon = 2.92/12 = 0.243mol

1.94 g. of oxygen = 1.94/16 = 0.12125mol

0.49 g. of hydrogen = 0.49/1.01 = 0.485mol

Dividing by least mole number 0.12125

Mole ratio C = 2

Mole ratio O = 1

Mole ratio H = 4

Empirical Formula = C2H4O

Empirical formula weight = 44

n = 176/44=4

Molecular Formula = 4(C2H4O) = C8H16O4

3.

2Na + 2H2O = 2NaOH + H2

2LiOH + H2SO4 = Li2SO4 + 2H2O

2AgNO3 + BaCl2 = 2AgCl(s) + Ba(NO3)2

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