Can someone help me to answer this correctly, please, and explain it. Please answer these 3 short questions, I don't have more money to buy more questions. These 3 questions are different.

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According to the following reaction, how many moles of mercury(II) oxide are necessary to form 0.200 moles oxygen gas? mercury(II) oxide (s) mercury (I) + oxygen (g) moles mercury(II) oxide According to the following reaction, how many moles of mercury will be formed upon the complete reaction of 0.426 moles mercury(II) oxide? mercury(II) oxide (s) mercury (I) + oxygen (g) moles mercury According to the following reaction, how many moles of mercury(II) oxide are necessary to form 0.200 moles oxygen gas? mercury(II) oxide (s) mercury (I)+ oxygen (g) moles mercury(II) oxide