Which is the molar mass of h2o? 10.02 g/mol 16.00 g/mol 17.01 g/mol 18.02 g/mol

Answer;

Molar mass of water is 18.02 g/mol

Explanation;

-Molar mass of a compound is determined by adding the relative atomic mass of each atom present in the compound. Molar mass of one mole of a compound, it is the weight in grams of  6.02 × 1023 atoms or molecules.

-Therefore; to calculate the molar mass of Water (H2O);  we first know the RAM of hydrogen and oxygen which are; H=1.01 and O= 16.00

Since there is two atom of hydrogen and one atom of oxygen in water;

Then; the Molar mass of water  will be; 2×1.01 + 1 ×16 = 18.02 g/mol

Molar mass:

Molar mass of any element is equal to the atomic mass of that element in the unit of grams. Molar mass is also equal to the mass of 6.02*10^23   atoms of that element.  

The water or H2O is formed from 2 mole of hydrogen and one one of oxygen

The molar mass of H = 1.008 g/ mole

The molar mass of O= 16.00g/ mole

Therefore the molar mass of water = 2* 1.008 g/ mole+16.00g/ mole

                                                    =18.02 / mole

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.