Chemistry

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Thank you!

I redid my questions and I got the following answers. Please let me know if they are correct!
I am really unsure about the significant digits!

1. 135.32g NH3
2. 1.85g H2
3. 9.93X10^19 molecules.

• Chemistry -

135.32 is right but I'll need to find the question again to check the others. Also, I doubt that the number of significant figures correct for this one.
I'll get back to you here.

• Chemistry -

I would round #1 to 3 places; i.e., 135 g.
#2 looks ok.
#3. I have 9.91 x 10^19 BUT I think we used slightly different molar mass for H2. Just check the numbers on your calculator to make sure.

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