Consider the balanced chemical equation that follows. you are asked to determine how many moles of water you can produce from 4.0 mol of hydrogen and excess oxygen. (excess oxygen means that so much oxygen is available it will not run out.) which of the numbers that appear in the balanced chemical equation below are used to perform this calculation? 2h2(g)+o2(g)→2h2o(l)

4 moles of water are produced.

Number 2 is used to perform this calculation

Explanation:

The balanced chemical equation is:

As it is given, excess oxygen is present, oxygen acts as excess reagent and hydrogen acts as limiting reagent as it limits the formation of products

According to stoichiometry:

2 moles of hydrogen give = 2 moles of water

Thus 4 moles of hydrogen give = moles of water

4 moles of water are produced . Thus the coefficient 2 from hydrogen and coefficient 2 from water that appear in the balanced chemical equation is used.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.