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A sample of sodium chloride (NaCl) has a mass of 17.45 g.

A) Calculate the number of moles of NaCl in the sample. Show your work.

B) Calculate the number of moles of EACH element (number of moles of Na and number of moles of Cl) in NaCl in the sample. Use your answer from Part A as a starting point. Show your work.



I’m struggling a little bit with how to approach this problem and solve it. Could someone please help me out? :)

Respuesta :

krgspace03

Part A: Given mass of NaCl * 1mol of NaCl/molar mass of NaCl = # of moles


17.45 g NaCl * 1 mole of NaCl /58.44 g NaCl = 0.298 moles of NaCl

Part B: First, let’s start with sodium, Na. To find the given mass of sodium, divide the given mass of NaCl (17.45)/the molar mass of NaCl(58.44) and multiply that by the molar mass of Na(22.99) to get the given mass of Na.


Given mass of Na * 1mol of Na/molar mass of Na= # of moles of Na.  

6.864* 1mol Na/22.99 g Na=0.298 moles of sodium.


Repeat the above steps with chlorine.  


Given mass of Na or Cl*1mol of Cl/molar mass of Cl = # of moles Cl.  

10.58* 1mol Cl/ 35.45 g of Cl= 0.298 moles of chlorine.

I wish you well on the rest and let me know of you need any more help by messaging me on Brainly.

Good Luck :)


Btw sry for answering so late.

 


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