2. If I have 45 g of Carbon, to find the number of moles of carbon I would *
divide by molar mass (12.01 g)
multiply by molar mass (12.01 g)
divide by Avogadro's number (6.02 x 10^23)
multiply by Avogadro's number (6.02 x 10^23)
Sushmit

divide by molar mass (12.01 g)

Explanation:

To find the number of moles of the carbon, divide by molar mass (12.01 g).

The number of moles of a substance is given as;

           Number of moles  =

To solve this problem;

  since mass of carbon  = 45g

                Number of moles  =   = 3.75moles

3.35 moles.

Explanation:

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.