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G. 13

Posted: Sun Oct 06, 2019 1:01 pm
by Mansi_1D
To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20 m NH4NO3(aq) by adding 3.0 L of water. The florist then adds 100. mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive?

Can some walk me through the steps to find the moles of nitrogen atoms please.

Re: G. 13

Posted: Sun Oct 06, 2019 1:05 pm
by 405318478
You would first find the molarity of the new solution using the equation M1V1=M2V2, then using the equation Molarity = (Moles)/(Volume) find the moles in 100mL.

Re: G. 13

Posted: Sun Oct 06, 2019 4:04 pm
by Malia Shitabata 1F
405318478 wrote:You would first find the molarity of the new solution using the equation M1V1=M2V2, then using the equation Molarity = (Moles)/(Volume) find the moles in 100mL.


I followed this but I'm not sure it gave the right answer since the solution manual said the concentration should be 0.050 and I got 0.067 and I feel like that's too far off to just be a sig fig or rounding error. And then my final answer for moles was 0.013 but it should be 0.010 or is my answer acceptable?

Re: G. 13

Posted: Sun Oct 06, 2019 5:56 pm
by Bradley Whitworth 4B
To start you would use m1v1=m2v2 to figure out m2 in this problem taking careful note that the v2 is NOT the second volume they give you because it is being ADDED to the first volume in this instance so the actual v2 would be v1 plus the amount being added. Once you find the m2 we know that molarity=moles/volume so with the found m2 we can plug that in as molarity and plug in the 100ml given by the problem (converted to liters) to solve for the amount of moles of nitrogen each plant gets

Re: G. 13

Posted: Sun Oct 06, 2019 5:58 pm
by Bradley Whitworth 4B
To start you would use m1v1=m2v2 to figure out m2 in this problem taking careful note that the v2 is NOT the second volume they give you because it is being ADDED to the first volume in this instance so the actual v2 would be v1 plus the amount being added. Once you find the m2 we know that molarity=moles/volume so with the found m2 we can plug that in as molarity and plug in the 100ml given by the problem (converted to liters) to solve for the amount of moles of nitrogen each plant gets

Re: G. 13

Posted: Sun Oct 06, 2019 6:02 pm
by Miriam Villarreal 1J
Dilution Formula: M1V1=M2V2
Therefore, (0.20NH4No3)(1.0L)=M2(4.0L) - you add the 3.0L and 1.0L
=.05 mol NH4NO3