Question

which of the following statement is correct for the reaction a l + HCL gives alcl3 + H2 given atomic mass of Al is 27 gram
a) the reaction equation follow the law of conservation of mass
b) if 27 g of l combined with 30 6.5 g of a croute 1335 g of alcl3 2 gram of H2
c) the given reaction is an example of combination reaction​

Answer 1

Answer:

mark me as brainless because I have no brain

Answer 2

The answer is a).

Explanation: This is an unbalanced  reaction:

Al+HCl→AlCl3+H2.

Balance Cl

To balance the Cl atom on both the reactant and product side, make the coefficient of the Cl atom the same.  So, we are adding a coefficient of 3 in HCl.

Al+3HCl→AlCl3+H2

Now, there are 3 Cl atoms on both sides.

Balance H

The number of H atoms in the reactants is 3, and in the product, there are 2 H atoms. To make the H atoms equal on both sides, we will multiply the coefficient of 3 in HCl. Hence, the coefficient of HCl changes to 6. We will also add a coefficient of 2 in H2.

Al+6HCl→AlCl3+3H2

There are now 6 H atoms on both sides.

Now the number of Cl atoms in the reactant is 6, and 3 Cl atoms in the product. We will add a coefficient of 2 in AlCl3 to make the Cl atoms equal on both sides.  

 Al+6HCl→2AlCl3+3H2

Now, there are equal Cl atoms on both the reactant and product side as well.  

Balance the Al

There are single Al atoms present in the reactants and 2 Al atoms in the products.  So, we will add 2 as a  coefficient in Al on the reactant side.  

 2Al+6HCl→2AlCl3+3H2

Therefore, after balancing the chemical equation, the number of Cl atoms, Al atoms, H atoms are equal.  

So, the reaction will have equal mass on both sides. Hence, the reaction follows the law of conservation of mass.