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12. Which of the following formulas is not correct? a. AlPO4 b. KClO4 c. CaS d. Na(NO3)2 e. Na2HPO4  

15.  If 1.36 g of an unknown molecular compound contains 8.35 x 1021 molecules, what is its molar mass? a. 44.0 g/mol b. 66.4 g/mol c. 72.1 g/mol d. 98.1 g/mol e. 132 g/mol

Which one of the following substances is classified as a chemical compound? a. Co b. Cr c. Mo d. HI

4. What is the correct formula for Chromium (III) oxide? a. Cr2O3 b. CrO2 c. Cr3O2 d. CrO

6. You have 2.50 g of each of the following elements: Ca, Cu, C, and Cr. Which sample contains the largest number of atoms? a. Ca b. Cu c. C d. Cr

8. What is the empirical formula of an oxide of nitrogen that contains 63.64 % nitrogen by mass? a. NO b. NO2 c. N2O d. N2O5

Which of the following is a strong acid in aqueous solution? a. CH3COOH b. Mg(OH)2 c. H3PO4 d. NH3 e. HNO3

Atomic number is the________ in the nucleus of an atom. a. number of protons minus the number of neutrons b. number of protons c. sum of the number of electrons and neutrons d. sum of the number of neutrons and protons

5. What is the molecular mass of cyclooctane, C8H16 (g/mol) ? a. 13 b. 97 c. 112 d. 155

A nurse is working in the prenatal clinic. Which of the following findings seen in a client in their third-trimester of pregnancy would the nurse consider to be within normal limits? Select all that apply.