December 04, 2020, 11:56:58 AM
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### Topic: How many moles of potassium are there in 40g of potassium arsenate?  (Read 1734 times)

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#### b0gummy

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##### How many moles of potassium are there in 40g of potassium arsenate?
« on: April 30, 2016, 10:57:01 PM »

How many moles of potassium are there in 40g of potassium arsenate?

What I have done so far

Molar Mass of Potassium Arsenate (K3AsO4) = 256.2165
Mass of Potassium Arsenate (K3AsO4) = 40g
Number of Moles of (K3AsO4) = 40g/256.2165 (=0.1561 mol)

Not entirely sure of how to get from 0.1561 mol to the number of moles of potassium in 40g of potassium arsenate. Help?

#### b0gummy

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##### Re: How many moles of potassium are there in 40g of potassium arsenate?
« Reply #1 on: April 30, 2016, 11:11:18 PM »
Nevermind, I have solved this problem. I used ratios to solve for it.

3 mol K/1 mol K3AsO4 = x mol K/0.1561 mol AsO4