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J. 24 g of carbon reacts with some oxygen to make 88 grams of carbon dioxide. Find out how much oxygen must have been used.
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Given :: mass of Carbon = 24 g , mass of carbon dioxide =88g

Find : mass of oxygen 

Solution ::

\(\begin{matrix} C & +\space O_2 & \rightarrow CO_2\\ 24g & ? & 88g \end{matrix}\) 

\(\therefore\) mass of oxygen = mass of carbon dioxide - mass of carbon

=88-24 = 64 g

mass of oxygen used in this equation is 64 g

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