Guys please I need an answer for this asap Mg+2HCl -> MgCl2+H2

0.2 mole of mg reacted with 0.2 of HCl

What is the mass of hydrogen gas produced?

Mass of hydrogen gas produced = 0.2 g

Explanation:

Given data:

Number of moles of Mg = 0.2 mol

Number of moles of HCl = 0.2 mol

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Mg + 2HCl       →     MgCl₂ + H₂

Now we will compare the moles of of hydrogen with Mg and HCl.

                   Mg          :        H₂

                    1             :         1

                   0.2          :       0.2

                 HCl           :       H₂

                   2             :         1

                0.2            :         1/2×0.2 = 0.1

HCl produced less number of moles of hydrogen gas it will act as limiting reactant.

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.1 mol × 2 g/mol

Mass = 0.2 g

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

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