Ascientist wished to carry out a chemical reaction in which two moles of aluminum combine with three moles of sulfur. he has 2.70 g of aluminum to react. how many grams of sulfur must he take to satisfy all the aluminum atoms?
1.51 g
2.14 g
3.41 g
4.81 g

Answer : The correct option is, 4.81 g

Explanation : Given,

Mass of aluminium = 2.70 g

Molar mass of aluminium = 26.98 g/mole

Molar mass of sulfur = 32.07 g/mole

First we have to calculate the moles of aluminium.

Now we have to calculate the moles of sulfur.

According to the question,

As, 2 moles of aluminium react with 3 moles of sulfur

So, 0.1 mole of aluminium react with of sulfur

Now we have to calculate the mass of sulfur.

Therefore, the mass of sulfur he take must be, 4.81 g

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.