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The chemical formula for diethyl ether is (CH3CH2)2O . Calculate the molar mass of diethyl ether. Round your answer to 2  decimal place. (If you wish, you can show math work for possible partial credit.)

Measurements show that unknown compound X has the following composition: element  mass % carbon 74.02% hydrogen 8.710% nitrogen 17.27% Write the empirical chemical formula of X?

The reaction of 8.000 moles of C8H18  with excess O2 produced of  2513 g of CO2.  What is the percent yield?   2 C8H18 + 25 O2  →  16 CO2 + 18 H2O

Bonus (5 pts) A 42.5 mL sample of Ca(OH)2 solution was titrated with 64.23 mL of a 1.25 M HCl solution to the equivalence point.  What is the molarity of the Ca(OH)2? Ca(OH)2 (aq) + 2 HCl(aq)  CaCl2(aq)  + 2 H2O(l)  

Balance the following equation (note: if the answer is 1 write 1 in the space, do not leave it blank): [1] S8(s) + [2] O2(g) + [3] H2O(l)    [4] H2SO4(l)

What is the net ionic equation for the reaction of hydroiodic acid with sodium hydroxide?

This is the chemical formula for chromium(III) nitrate: Cr(NO3)3. Calculate the mass percent of oxygen in chromium(III) nitrate.  Round your answer to the first decimal place. (If you wish, you can show math work for possible partial credit.)

The chemical formula for dimethyl ether is: CH3OCH3 Calculate the molar mass of dimethyl ether.  Round your answer to decimal places.

Write the oxidation number of the selected element in: K in KNO2 is [K] P in P4 is [P] Cr in Cr2O72- is [Cr] S in S2- is [S]

Which is the limiting reactant? [LR] (Note: you will not be able to use subscripts, write answer without subscripts) How many molecules of gaseous water will theoretically be produced? [H2O] molecules