Question

Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 19.4 of Mg are heated with 14g of H2O what is the limiting reaction? How much is the excess reactant is left? Answer in units of mol How much Mg(OH)2 is formed? Answer in units of g 

          Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 19.4 of Mg are heated with 14g of H2O what is the limiting reaction?
How much is the excess reactant is left?
Answer in units of mol
How much Mg(OH)2 is 
formed?
Answer in units of g
Show more…

Added by Crystal C.

Chemistry: Structure and Properties
Chemistry: Structure and Properties
Nivaldo Tro 2nd Edition
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Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 19.4 of Mg are heated with 14g of H2O what is the limiting reaction? How much is the excess reactant is left? Answer in units of mol How much Mg(OH)2 is formed? Answer in units of g
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Transcript

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00:01 Good day in this question we are asked to identify which is the limiting reactant and solve for the excess reactant and the the mass of mjoh -h form so first we need to write the balance equation between magnesium plus 2 h2 will yield magnesium hydroxide plus h2 next we solve for most of each reactant to identify which is the limiting reactant from 19.
00:31 4 grams mass divided by molar mass of 24 .305 grams per mole.
00:37 This is equals to 0 .78 mole.
00:43 Next, mole of h2o.
00:45 This equals to mass, 14 grams divided by molar mass of 18 .02 grams per mole.
00:51 This is equals to 0 .77 mole.
00:56 Next, we solve for the mole of magnesium needed to react from h2o.
01:02 This is equals to from 0 .777 -mol of h2o times one mole of magnesium is 2 mole of h2o...
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