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- Feb 29, 2016
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The problem:
How many grams of HCl is required to form 4.0 grams of hydrogen gas in the equation below?
Zn + 2HCl ---> ZnCl2 + H2
Is it okay that I solved it like this?
2HCl = X
H2 4.0g (this <----4 is after the equal sign but sdn is not allowing that )
I set it up as a fraction, then I thought about it and realized 4 grams of h2 really means 2*h2.
Next I did this,
4HCl = added it up
Yes, I got the right answer, but can I do it like this? Will I always get the right answer doing it my way?
Versus....
mass of hcl = 4.0g h2 (1 mol h2/2.0g h2) (2mol hcl/1 mol h2) (36.5g hcl/1 mol hcl) = 146g
How many grams of HCl is required to form 4.0 grams of hydrogen gas in the equation below?
Zn + 2HCl ---> ZnCl2 + H2
Is it okay that I solved it like this?
2HCl = X
H2 4.0g (this <----4 is after the equal sign but sdn is not allowing that )
I set it up as a fraction, then I thought about it and realized 4 grams of h2 really means 2*h2.
Next I did this,
4HCl = added it up
Yes, I got the right answer, but can I do it like this? Will I always get the right answer doing it my way?
Versus....
mass of hcl = 4.0g h2 (1 mol h2/2.0g h2) (2mol hcl/1 mol h2) (36.5g hcl/1 mol hcl) = 146g
Last edited:
