Al + h2so4 → al2(so4)3 + h2 when the equation is correctly balanced, the coefficient of h2so4 is -

First, we have to balance the equation:

Al +  H2SO4 → Al2(SO4)3 + H2

we have the number of Al atoms not equal on both sides so we will put 2 Al instead of Al on the left side of the equation.

2Al + H2SO4  → Al2(SO4)3 + H2 

now we have an unequal number of (SO4) group on both sides of the equation so we put  3H2SO4 instead of H2SO4

2Al + 3H2SO4 → Al2(SO4)3 + H2

now, we have to put 3H2 instead of H2 to make the H atoms equals on both sides.

2Al + 3H2SO4 → Al2(SO4)3 + 3H2 this is the final balanced equation.

∴ the coefficient of  H2SO4 is 3

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