7.86 x 10^ -4.
This is because you move the decimal place back 4 places making it negative
A) Al4C3 moles in 100g=100g/144gmol¹-
Molar mass of Al4C3=144gmol¹-
one mole of Al4C3 reacts with 12 moles of water
required H2O moles=100/144*12=8.33mol
Do other parts like this.Hope u can do it yourself now
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