A sealed tube containing phosphorus was weighed and heated carefully. After completion of the reaction, the tube was re-weighed under similar conditions. The weight of the tube will:
A
increases
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B
decreases
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C
remains same
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D
None of the above
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Solution
The correct option is B remains same According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products in a chemical reaction.
P4+5O2→P4O10
As the tube is sealed, the total mass of reactants, P4 and O2 is equal to the total mass of product formed i.e., phosphorus pentaoxide.