Calculate the mass percent of a solution that is prepared by adding 58.0 of to 341 of .

Question

Calculate the mass percent of a solution that is prepared by adding 58.0  of to 341  of .

rogue · Answer

Adding 58 monkeys to a zoo of 341 animals? =P
What is your full question? Don't leave out units :)

anonymous · Answer

58.0 grams of NaOH to 341 grams of of H2O 
Im sorry for leaving the units out :p

rogue · Answer

When you add 58 g of NaOH to a solution that is 341 g, the new mass of the solution is 58 g + 341 g = 399 g. Now that 58 g of NaOH is a part of the whole 399 g solution. Mass percent is the mass of the part divided by the mass of the whole, times 100%.
(58 g / 399 g) * 100% = 14.536%

anonymous · Answer

OH thank-you so so much :)

anonymous · Answer

one more question

anonymous · Answer

mass/volume percent of a NaCl solution in which 102 g of NaCl is dissolved in enough water to give a total volume of 1.58 L.

anonymous · Answer

the answer to this would be 6.46% right?

rogue · Answer

Sorry, was afk all this time. 6.46% seems right. 102g/1580 L * 100%.

rogue · Answer

1580mL*