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A 1.000 g sample of a compound containing the elements carbon, hydrogen, oxygen, and nitrogen was burned in excess oxygen. The products were collected and had the following masses: CO2: 1.707 g N2: 0.136 g H2O: 0.7859 g For this compound (CaHbOcNd) what are the integers a,b,c and d in the empirical formula?
The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________ V when [Zn2+] = 2.5 M and [Pb2+] = 1.5 × 10-4 M Pb2+ (aq) + Zn (s) ? Zn2+ (aq) + Pb (s)
Calculate the [OH-] in 0.050 M potassium fluoride, KF The answer choices are: A. 8.3 × 10-7 M B. 4.7 × 10-7 M C. 6.2 × 10-7 M D. 1.4 × 10-6 M E. 2.2 × 10-6 M
Calculate the resulting pH if 455 mL of 0.200 M HCl is mixed with 315 mL of 0.0850 M Ca(OH)2.
Complete the following table for aqueous solutions of potassium hydroxide. a. given: density (g/mL):1.05 molarity:1.13 find molality and mass percent of solute b. given: density (g/mL):1.29 Mass percent of solute:30 find molarity and molality c.gi..
Beta sheets are a type of secondary structure in proteins. A segment of a single chain in an antiparallel. sheet has a length of 172 Å . How many residues are in this segment
Briefly explain how a lake with a limestone bed is more resistant to pH changes than a lake with a granite bed
Phosphate can buffer in three pH ranges. Give the chemical formulas of the buffer pairs and give the range in which each buffers. Start with H3PO4/ H2PO4-1
Calculate the ionic strength of a solution containing 0.010 M calcium sulfate and 0.010 M sodium chloride. Show all work.
If the absolute temperature of a gas is doubled, what happens to the root-mean-square speed of the molecules?
It is desired to inflate a baggie with a volume of 869 milliliters by filling it with hydrogen gas at a pressure of 0.847 atm and a temperature of 296 K. How many grams of H2 gas are needed? answer in g please
it is found that 1.431 g of element x contains 7.509 times 1021 atoms. the atomic mass of x is? how many protons does
A sample of clay was obtained from a point below the groundwater table. A moisture content test on this sample produced the following data
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