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CBSE Class 10 Answered

what mass of magnesium oxide is formed when 120g of Mg is burnt in exess of oxygen

Asked by nathsantanukumar | 30 Oct, 2018, 08:45: AM
Expert Answer
The chemical equation for burning of magnesium;
 
space space space 2 Mg subscript open parentheses straight s close parentheses end subscript space space space space plus space space space space straight O subscript 2 subscript open parentheses straight g close parentheses end subscript end subscript space space space space rightwards arrow with blank on top space space space space space 2 MgO

space open parentheses 2 cross times 24 close parentheses space space space space space space space space space space open parentheses 32 close parentheses space space space space space space space space space space space space space space open parentheses 2 cross times 40 close parentheses

48 space space space space space space space space space space space space space space space space space space space space 32 space space space space space space space space space space space space space space space space space space space space 80

48 space straight g space of space magnesium space produce space 80 space straight g space of space MgO

therefore space 120 space straight g space of space Mg space will space produce space space fraction numerator 120 cross times 80 over denominator 48 end fraction

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 200 space straight g space of space MgO
200 g of MgO is formed on burning 120 g of magnesium.
Answered by Varsha | 30 Oct, 2018, 12:39: PM
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