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30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the ...

30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction

A. 50cm3
B. 35cm3
C. 30cm3
D. 25cm3




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