Posted by Ochaya on Monday, September 28, 2009 at 12:26pm.
You can make an arrow one of two ways. ==> or ---->.
When you say "amount of hydrogen" is that amount by volume or amount by mass. I will assume you mean mass.
Convert 12 g Mg to moles. moles = grams/atomic mass.
Using the coefficients in the balanced equation, convert moles Mg to moles hydrogen.
Convert moles hydrogen to grams using grams = moles x molar mass.
The arrow is after 2HCL and giving the following. MgCl2(aq) + H2 (g)
What amount of H2(g) is produced when 12g of magnesium reacts completely with dilute HCl(aq)
Mg(s) + 2HCl(aq) ------> MgCl2(aq) + H2(g)
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