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The decomposition of dimethyl ether (CH3OCH3) to methane, carbon monoxide, and hydrogen gases is found to be first-order. At 500 C, a 150.0-mg sample of dimethyl ether is reduced to 43.2 mg after three quarters of an hour. Calculate: a.the rate constant b.the half-life at 500 C c.how long will it take to decompose 95% of the drug?
a sample of HCI is placed in a 256ml flask where it exerts a force of 67.5 mmHg. What is the pressure of the gas if it is transfered to a 135mL flask?
if you used 8900 kilojoules you expend in energy in one day to heat 49000g of water at 19 C what would be the rise in temperature.
Caffeine is made up of 49.5% C, 5.2% H, 16.5%O, and 28.9% N. A solution made up of 8.25g of caffeine and 100.0 of benzene (d=0.887g/ml) freezes at 3.03C. Pure benzene (kf=5.10 degrees C/m) freezes at 5.50C.
Number of protons & the number of neutrons in the nucleus of the element boron and potassium and the number of electrons in their 1st & 2nd quantum shells?
The total volume of both metals is measured by the displacement of water to be 426 and the total mass is 4.40 . What percentage of the spheres are copper?
Describe two different ways by which electrons can move from the valence band to the conduction band.
It takes 51.0 J to raise the temperature of an 10.2 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal
If 10.0 mL of .300 M KOH are required to neautralize 30.0 mL of gastric juice (HCl), what is the molarity of the gastric juice?
Determine the characteristic wavelengths if an electron are accelerated through an electric potential to a kinetic energy of 18kev.
An environmental chemist obtained a 200 mL sample of lake water believed to be cntaminated with a single monoprotic strong acid.
A steel tank has a volume of 438 L and is filled with 0.885 kg of oxygen. calculate the pressure of oxygen at 69.8 fahrenheit.
what is the molarity of a solution prepared by combining 125mL of 0.251 molar HCl with 250mL of pure water
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