One molecule of a compound weighs 2.93  10–22 g. The molar mass of this compound is: A)
2.06 g/mol
B)
567 g/mol
C)
168 g/mol
D)
176 g/mol
E)
none of these

176 g/mol

Explanation:

To get this, multiply the weight of the molecule by Avogadro's number:

(2.93×) × (6.022×) = 176.44 g/mol

it's all four options.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.