I need help finding the w/w%, w/v%, and molarity. Suppose you have a 15.0 mL of

Question

I need help finding the w/w%, w/v%, and molarity. Suppose you have a 15.0 mL of a NaCl solution that weighs16.35 g. You pour the solution into a beaker and heat thesolution to dryness. If the dry salt in the beaker weighs4.16 g, calculate the w/w,w/v, and molarity. I need help finding the w/w%, w/v%, and molarity. Suppose you have a 15.0 mL of a NaCl solution that weighs16.35 g. You pour the solution into a beaker and heat thesolution to dryness. If the dry salt in the beaker weighs4.16 g, calculate the w/w,w/v, and molarity.

Explanation / Answer

For the w/w you just divde the ending weight by the startingweight and times by 100. 4.16/16.35=.2544*100=25.44% For the w/v is the ending weight divided by the volume 4.16/15=.2773g/mL*100=27.73%g/mL Then for the molarity you need to find the number of moles ofNaCl present and divide that by the number of L of solution. molar mass of NaCl=58.4430 g/mol number of mol of NaCl is 4.16g/58.4430 g/mol=.07118mol divide that by the solution volume in L .07118mol/.015L=4.75 M which is your final answer

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