6HCl(aq) + 2A1) -
3H2(g) + 2AlCl3(aq)
1. How many moles of hydrogen are produced from 1.20 moles of aluminum?

1.80 moles of will be produced 1.20 moles of aluminium.

Explanation:

To calculate the moles :

The balanced chemical reaction is:

According to stoichiometry :

2 moles of produce = 3 moles of

Thus 1.20 moles of will produce=  of

Thus 1.80 moles of will be produced 1.20 moles of aluminium.

answer; /// the amount of material dissolved in a measure of liquid(concentration) the above statement is (true); /// good luck

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.