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I need help with this! the problem says

"Thimerosal is an organic compound (gram-molecultar mass = 404.8 g/mol). A .100% solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL."

I need help with these two:

What mass of thimerosal must be mixed with 25.0 g of water to make a .100% solution?

What volume of 0.100% solution contains 0.750 g of thimerosal?

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Q: How many grams of thimerosal are required to make 50 g of 100 percent solution?
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