Mercury metal reacts with oxygen to form the bright orange, mercury(II) oxide...?

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Monica V

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Mercury metal reacts with oxygen to form the bright orange, mercury(II) oxide
2Hg+O2 --> 2HgO

if 200g of Hg and 30g of O2 are mixed, which is the limiting reagent?
and how many grams of HgO can be formed from this mixture?
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A 1.23 mL sample of a 1.25M solution of barium chloride was diluted to 25 mL. What is the final concentration of the diluted solution?
What mass of sodium sulfide is required to prepare 250 mL of 0.2M solution?
 
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