Confusion on H.3

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RRahimtoola1I
Posts: 102
Joined: Fri Aug 09, 2019 12:15 am

Confusion on H.3

Postby RRahimtoola1I » Thu Oct 03, 2019 3:44 pm

For Question 3, Section H, I balanced the equation and got:

SiH4 + 2H2O > SiO2 + 4H2

but the answer doubles all the coefficients, even though the way I did it above is balanced. Is there a reason for this?

Thank you in advance!

Isabel Day 1D
Posts: 48
Joined: Fri Aug 09, 2019 12:15 am

Re: Confusion on H.3

Postby Isabel Day 1D » Thu Oct 03, 2019 3:57 pm

Yes, your equation is balanced but it doesn’t represent the amount of reactants and products in the boxes. In the first box there are 4 H20 molecules and 2 SiH4 molecules. In the second box there are 2 SiO2 molecules and 8 H2 molecules. Therefore, the equation that’s both balanced and represents the molecules in the boxes is:

2SiH4 + 4H2O —> 2SiO2 + 8H2

Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

Re: Confusion on H.3

Postby Letty Liu 2C » Thu Oct 03, 2019 4:24 pm

^^ I matched the molar ratio of the molecules in the figure with the stoichiometric coefficients in the equation.


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