If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, which element is the reactant in excess? 3h2 + n2 → 2nh3

nitrogen

Explanation:

The stoichiometry of the reaction says that and   react 3:1 to form 2 moles of  , so, if you have 3,5 moles of H, which is equal to 1,75 moles of  , and 5 moles of N, which are equal to 2,5 moles of  . only=0.583 moles of  , will react, leaving 1.917 moles of unreacted, and forming 0.583*2=1.166 moles of  

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.