30g of magnesium and 30g of oxygen are reacted when the residual mixture contains
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50 g MgO + 10 g O2
Explanation...
2Mg+ O2 --> 2 MgO
According to the above reaction,
28.6 g (2 mole) Mg combine with 32 g (1mole) of O2 to give 80.6g(2mole) of MgO.
thus,
30 g Mg will combine with 20 g of O2 to produce 50 g MgO and 10 g O2 will remain unreactive.
50 g MgO + 10 g O2
Explanation...
2Mg+ O2 --> 2 MgO
According to the above reaction,
28.6 g (2 mole) Mg combine with 32 g (1mole) of O2 to give 80.6g(2mole) of MgO.
thus,
30 g Mg will combine with 20 g of O2 to produce 50 g MgO and 10 g O2 will remain unreactive.
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