40.0g NaCl that is 90% by Mass, find Mass

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To prepare a 40.0g NaCl solution that is 0.90% by mass, the mass of NaCl needed can be calculated using the mass percentage formula. The formula states that mass percentage equals the mass of solute divided by the total mass of the solution, multiplied by 100. By rearranging this formula, one can determine the required mass of NaCl. In this case, the calculation yields approximately 0.36g of NaCl. This approach simplifies the process and clarifies the necessary steps for solving similar problems.
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1. You will prepare 40.0g of a NaCl solution that is 0.90% by mass. Calculate the mass of the NaCl that is needed.


2. I don't know the proper equations/steps to find the answer, this is really what I need help with.


3. I have not made an attempt yet as I don't know how to go about making an attempt. Hopefully somebody could point me in the right direction so I can figure this out.

Also I did do a search though I was unable to find anything that seemed to deal with my situation.

-Britt
 
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Try looking at it this way first: If you needed to prepare a 100. g solution of NaCl that is 10.0% by mass, what mass of NaCl is needed?
 
Other hint: you can solve the question using just definition of mass percentage and basic algebra to rearrange the formula.
 
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Thanks for the help it seemed I was over thinking the question a bit. I came up with 0.36g NaCl
 
Can't say I am surpsised :smile:
 
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