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VuDu
VuDu Asked:

How many grams of ammonia, NH3, are in 200ml of a 1.3M solution

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John McCann
John McCann Answered:

To find moles ammonia,

 

Molarity = moles of solute/Liters of solution (200 ml = 0.2 Liters)

 

1.3 M NH3 = X moles NH3/0.2 Liters

 

= 0.26 moles NH3

----------------------------Now,

 

0.26 moles NH3 (17.034 grams/1 mole NH3)

 

= 4.4 grams ammonia in solution

======================

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OronD
OronD Answered:

1.3M means 1.3 moles of NH3 in 1 liiter.
As you have only 1/5 litter of that sollution you have 1.3/5 or 0.26 moles of NH3. 
1 mole of NH3 weights roughly 17 g"r (14 + 3*1)
yous have only 0.26 moles so it will weight 17*0.26 = 4.42 g"r of NH3 at that solution 

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