Week 3 Discussion CHEM131.docx - Show to work 100 word...

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Thompson, Melissa: Problems 3.51 and 4.63
Good ________ Everyone,
3.51)Calculate the number of moles and the mass of the solute in each of the following solutions:
(a) 2.00 L of 18.5 M H2SO4, concentrated sulfuric acid
(b) 100.0 mL of 3.8 × 10−5 M NaCN, the minimum lethal concentration
of sodium cyanide in blood serum
(c) 5.50 L of 13.3 M H2CO, the formaldehyde used to “fix” tissue
samples
(d) 325 mL of 1.8 × 10−6 M FeSO4, the minimum concentration of iron
sulfate detectable by taste in drinking water
(a) Mol 37. Mass 3591.405
(b) Mol 3.8e^-7. Mass1.52e^-4
(c) Mol 73.15. Mass 2194.5
(d) Mol 5.85e^-7. Mass 8e^-4
4.63) A student isolated 25 g of a compound following a procedure that would theoretically yield
81 g. What was his percent yield?