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A sample of ammonia, NH3, contains 3.3 x 1021 hydrogen atoms. How many moles of ammonia are in this sample?
Polycyclic aromatic hydrocarbons (PAHs) are a class of organic chemicals associated with the combustion of fossil fuels. Undeveloped areas may have total PAH soil concentrations of 5 µg/kg
The resulting W3 was transferred to 500.0 mL of 1.00 M HCl. A 100.00 mL aliquot of the HCl solution required 10.13 mL of 0.08840 M potassium permanganate (KMnO4) to reach the purple endpoint. A blank required 0.18 mL. Determine the percent WO3 in ..
A 0.01 M solution of hyperchlorous acid , which is a monoprotic acid, has a pH of 6.5 at 67 degrees C. Determine the Ka value of this acid.
a close chemical relative of the banned insecticide ddt is methoxychlor c16h15cl3o2. methoxychlor is currently used as
The following data were recorded in the analysis of erythropoietin in a plasma sample, as mg/dL. Which of the results, if any, could be statistically rejected with 95% confidence?
Solving this question helps the student to understand how to find molecular formula using moles and mass and What is the molecular formula of this compound?
How many grams of methanol must be added to 7.50kg of water to lower its freezing point to -15.0^circ C? For each mole of solute, the freezing point of 1 {rm kg} of water is lowered 1.86 ^circ {rm C}
Discuss the difference between Mass Spectroscopy, Nuclear Magnetic Resonance,
What observed rotation is expected when a 1.02 M solution of (R)-2-butanol is mixed with an equal volume of a 0.510 M solution of racemic 2-butanol
A heliox deep-sea diving mixture contains 6.0% oxygen and 94.0% helium.What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.0
If the hindenburg held 200000 m^3 of hydrogen gas at 23 degrees C and 1.0 atm, what mass of hydrogen was present
You are given the following data. S(s) + 3/2 O2(g) → SO3(g) ΔH = -395.2 kJ 2 SO2(g) + O2(g) → 2 SO3(g) ΔH = -198.2 kJ Calculate ΔH
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