balance the chemical reaction
Mg + 2HCl>>>H2 + MgCl2
so you need the same number of moles of Mg as you get in H2.
molesH2=100/2=50 moles
molesMg=same
gramsMg=atomicmassMg*50=24.3*50 grams.
when hcl reacts with mg, how many grams of magnesium are needed to produce 100 grams of hydrogen?
2 answers
Mg(s) +2HCl(aq)> MgCl2(aq) +H2(g)
RMM of H2 =2×1=2
No of mole of H2 =100/2
=50 moles
Mole ratio of Mg to H2 is 1:1
therefore, the no of moles of Mg is 50 moles
Mass= No of moles×RAM
=50×24
=1200g
RMM of H2 =2×1=2
No of mole of H2 =100/2
=50 moles
Mole ratio of Mg to H2 is 1:1
therefore, the no of moles of Mg is 50 moles
Mass= No of moles×RAM
=50×24
=1200g