By using the given ratio, we will find that, out of 500kg of water, we could produce 55kg of hydrogen gas.
How to find the mass of hydrogen that we can produc with 500kg of water?
We know that out of 100 grams of water, we can produce 11 grams of hydrogen gas.
Taking the quotient we get the ratio:
(11g/100g) = 0.11
We could conclude that for any mass of water we can produce 0.11 times that mass of hydrogen gas.
This means that if we have 500kg of water, then we can produce:
0.11*500kg = 55kg of hydrogen gas.
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