If 30 ml of H2 and 20 mL of O2 react to form water, what will be left at the end of the reaction?

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At the critical point for H2 gas, value of Z =3 / 8. Then, the value of Z for the similar conditions of CO2, O2, SO2 at their respective critical points will be :

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If 30 ml of H2 and 20 mL of O2 react to form water, what will be left at the end of the reaction?

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