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1. The spectral analysis of a chemical compound gave the following composition on a mass basis: 29.1% Na, 40.5% S, 30.4% O. Determine the chemical formula of this substance (i.e., find x, y, and z in NaxSyOz).
2. How many lbm are in 1 lbmole of
a. C12H22O11 (sucrose, a typical carbohydrate).
b. C57H110O6 (stearin, a typical fat).
c. C3032H4816O872N780S8Fe4 (human hemoglobin, a typical protein).
How much heat is required to warm 1.20 L of water from 20.0 degrees C to 100.0 degrees C ? (Assume a density of for the water.)
suppose that 500 g of water vapor condense to make a cloud about the size of an average room. if we assume that the
When the liberated hydrogen gas is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 343 mL. The vapor pressure of water at 29 degrees celsius is 30.0 torr. What is the mass percentage of aluminum in this alloy?
HF is a stronger acid than HBR because F has greater electronegativity than Br 2) the acid (HA) strength will increase when the H-A bond strength increases
What volumes of 0.01 M HCl are required to titrate 250 mL of 0.01 M Na2CO3 to the first equivalence point
Estimate dissociation energy of HF using simpe additivity rule If given that d(H-H) and D(F-F) IN H 2 is 336kj/mol and F2 is 258 kj/mol
Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (C2H5OH) using the standard enthalpies of formation of the reactants and the products
Calculate the energy change, in J, for 1 gmol of H2O 1) 0 to 100km/h 2) 0 to 100m 3) at 100'C from 0.1 bar to 1 bar 4) at 5bar from 0 to 100'C 5) Dissociating to H2 and O2 at 25'C
description of the mechanism of this reaction? tertiary carbanion, 2-methylpentoxonium ion, sp hybridized pentyne, vicinal dihydroxide, or hydroxide ion.
When doing a recrystallization, why is it important to allow the saturated solution to boil for ~1 minute and cool SLOWLY to room temperature before placing it in an ice-water bath?
radioactive decay of granite and other rocks in the earths interior provides sufficient energyto keep the interior
Two solutions, "A" and "B", are labeled "0.21 M CaCl2" and "0.34 M CaCl2", respectively. Both solutions contain the same number of moles of CaCl2. If solution A has a volume of 25 mL, what is the volume of solution B
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