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# Chemistry Homework help!

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This is part of a moles to moles worksheet I need help with.

Can someone help me with this problem, I don't know how to write down the "three moles of zinc and an excess of hydrochloric acid" part into a conversion equation.

iiVoidRavenZ  Apr 21, 2017
edited by iiVoidRavenZ  Apr 21, 2017
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The reaction states that for every atom of zinc, there are 2 atoms of hydrochloric acid

since the units are the same, we can simply change "atoms" to "moles"

So: 1 mole Zn + 2 moles HCl works in the equation

Since we have 3 moles of zinc, we can just multiply each part of the chemical reaction by 3 (chemical reactions are kind of like equations).

2 mol Zn + 6 mol HCl --> 3 mol ZnCl2 + 3 mol H2

H2 is hydrogen gas

therefore: 3 mol of hydrogen gas are created

helperid1839321  Apr 21, 2017
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Is this not sience or are you a greater grade than me BTW i am in 4th grade

Guest Apr 21, 2017
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This is Chemistry, a class you should be in when you are in 10th grade.

iiVoidRavenZ  Apr 21, 2017
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No, Its the class you should take after you finish watching breaking bad.

Guest Apr 22, 2017