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Fill-in-the blank.  Make sure to include the plus and negative signs.  Do not write spaces.  (Example: If the answer is positive four enter +4 not + 4).  The aluminum atom in Al(s) has an oxidation number of [1].  The chromium atom in the dichromate ion,  Cr2O72-, has an oxidation number of [2] The oxidation number of carbon in potassium oxalate, K2C2O4, is [3].

How many moles of ammonia, NH3, are there in 22.5g of ammonia?     (If you wish, you can show math work for possible partial credit.)

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?

When applying iontophoresis, the closer the dispersive and active pad are placed to each other, the ____________  the depth of penetration of the medication

Which of the following is not true regarding the heating effect provided by a moist heating pad:

Write the complete ionic equation for the following molecular equation.  Include phases.  (NH4)2CO3(aq) + Sr(NO3)2(aq)  →  2NH4NO3(aq) + SrCO3(s) 

RTP header compression can compress the combined Layer 3 and Layer 4 headers from 40 bytes down to how many bytes?

The molarity of an aqueous solution containing 75.3 g of glucose, C6H12O6,  in 35.5 mL of solution is __________.

Chlorine gas is considered a _____?

How many grams of sodium chloride, NaCl,  are there in 55.0 mL of a 1.90 M aqueous solution of sodium chloride?