"6.50 g C_2H_2 (\\frac{1 mole C_2H_2}{26.04 g C_2H_2})=0.250 mol C_2H_2"
2.Convert moles of C2H2 to moles of O2:
"0.250 moles C_2H_2 (\\frac{5 moles O_2}{2 moles C_2H_2}) = 0.625 moles O_2"
3.Convert moles of O2 to mass of O2
"0.625 moles O_2(\\frac{32.00 g O_2}{1 mole O_2})=20.0 g O_2"
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