Chemistry:Reaction Rate?

Zeek

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I have no idea how to solve this problem and I need help. If someone could help me, you would be my hero.

"We measure the evolution of oxygen gas to determine the rate of reaction, In the reaction 2HgO(s)---->2Hg(L)+O2. At the beginning of the reaction (at 0 min) 0.020L of 02 is present. After 15 min, the volume of 02 gas is 0.35L. What is the rate of reaction?
 
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