(5) solution
4HCL(g) +1O2(g)=2CL2 + 2H2O(g)
we can say that there 4 mole HCL reaction with 1 mole oxygen gas
from question, value of hcl=20.0 ml which is 4 mole
so we calculate the value of oxygen =20.0/4 ml
=5.0 ml
6) from reaction equation
CH4(g) +O2(g) = CO2(g) + 2H2O(g)
we can notice there is 1 mole CH4 reaction with 1 mole oxygen so both mole are same.
so it is clear that 5 ml O2 need when 5 ml CH4 present.
so oxygen is needed there 5ml
7) the reaction equation is
2cu(s) +s(s) = cu2s(s)
where 2 mole CU reaction with 1 mole S the the product is 1 mole of CU2S
If 3.0 mole cu and 1.0 mole s
total mole of left side=total mole of right side
3.0 mole+ 1.0 mole=cu2s mole
cu2s mole= 4.0 mole
so answer is 4.0 mole
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