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Chapter 3: Q 57E (page 171)
Question: There is about 1.0g of calcium, as Ca2+, in 1.0 L of milk. What is the molarity of Ca2+ in milk?
The molarity of Ca2+ in milk is 0.025M.
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The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including hexavalent chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate K2Cr2O7, what is the maximum permissible molarity of that substance?
Determine the molecular mass of the following compounds:
(a)
(b)
(c)
(d)
How are the molecular mass and the molar mass of a compound similar and how are they different?
What is the mass of 0.443 mol of hydrazine, N2H4?
Which contains the greatest number of moles of oxygen atoms: 1 mol of ethanol (C2H5OH), 1 mol of formic acid (HCO2H), or 1 mol of water (H2O)? Explain why.
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