How many moles of ethane, C2H6, are there in 22.5g of ethane?      (If you wish, you can show math work for possible partial credit.)

Chromium(VI)  is considered a hazardous, carcinogenic species, destruction of which may be accomplished by the process shown in the balanced equation below:             4 Zn (s) + K2Cr2O7 (aq) + 7 H2SO4 (aq) → 4 ZnSO4 (s) + 2 CrSO4 (s) + K2SO4 (aq) + 7 H2O (l) Which is the limiting reactant when 5.00 moles of Zn and 2.00 moles of  K2Cr2O7 react in excess H2SO4?

When solid sodium chloride is added to aqueous sulfuric acid, hydrogen chloride gas and aqueous sodium sulfate are produced. What is the stoichiometric coefficient for hydrogen chloride when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?

Which would be the most appropriate ultrasound (US) parameters to treat a tightened joint capsule of the posterior hip prior to stretching?

In reference to osmosis, fluid is drawn across a semi-permeable membrane to the side of _________________ solute concentration. 

If the kidneys are functioning normally, what percentage of an IV ROCM dose is excreted in a 24-hour period?

Match the following terms with their definitions. Write ONLY the NUMBER that is in the column on the left of the definitions in the answer field next to each term.  (There are more definitions than needed.)     Terms:  a) base- b)  theoretical yield- c) mole-     d) solvent –       Definitions:      1  solution component present in a concentration that is lower relative to other components 2  weighted average of the atomic masses of all stable isotopes of an element, in amu 3  solution component present in a concentration that is higher relative to other components 4  substance that produces OH− when dissolved in water 5  process in which an element’s oxidation number is increased by loss of electrons 6  amount of substance containing the same number of atoms, molecules, ions, or other entities as the number of atoms in exactly 12 grams of 12C 7 process in which an element’s oxidation number is decreased by gain of electrons 8  experimentally determined value of the number of entities comprising 1 mole of substance, equal to 6.022 × 1023 mol−1 9  amount of product that may be produced from a given amount of reactant(s) according to the reaction stoichiometry

Identify the spectator ions in the following molecular equation. (NH4)2CO3(aq) + Sr(NO3)2(aq)  →  2NH4NO3(aq) + SrCO3(s) 

In the GI tract, barium sulfate can produce an insoluble precipitate with calcium to form a:

True/False.   ALL radiopaque contrast media are derivatives of tri-iodinated benzoic acid.