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Topic: chemistry help please  (Read 1804 times)

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Offline elynsam123

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chemistry help please
« on: July 30, 2016, 05:26:55 PM »
I am having trouble with a review question. i know the answer since it is given in the back of the book. but i dont know how to get there.
How many grams of Ba3P2 would contain 4.23 g of Ba, if Ba3P2 contains 86.9% Ba by mass?

i know you use 86.9g Ba/100g ofBa3P2
i tried also converting 4.23 g Ba to moles but am having trouble with it all.
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Offline mikasaur

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Re: chemistry help please
« Reply #1 on: July 30, 2016, 06:07:14 PM »
You won't need to convert to moles. You're right that you'll need the ratio you have, but you may need to flip it. Think about that...
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Or you could, you know, Google it.

Offline Arkcon

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Re: chemistry help please
« Reply #2 on: July 30, 2016, 09:10:59 PM »
How many gumballs do I need to have, if I need 10 red gumballs, and the ones I have are half blue, and half red?

You have a slightly more difficult ratio, and your question asks for elements instead of gumballs, but the math is the same.
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Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.
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