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One type of sunbeam occurs on exposure to yellow light of wavelength in the vicinity of 589 nm. (a) What is the energy of a photon of this wavelength? (b). what is the energy of a mole of these photons?
Boron has two stable isotopes with masses of 10.01294 u and 11.00931 u. The average molar mass of boron is 10.81 u. What is the percent abundance of each isotope?
question typically an adult will inhale 2.1 l of air per breath. what mass of ozone is taken into the lungs per breath
A microwave oven operates at 2.40 GHz. What is the wavelength of the radiation produced by this appliance? in nano meters
Mass of Carbonates Needed to Raise Solution pH One Unit, An actual lab titration of a mildly acidic process water at a pH of 4.0 requires 0.9 grams/liter of Na2CO3 to raise the pH from 4.0 to 5.0; re-running the titration but this time using CaCO3..
A weather balloon is filled to 125 L when the atmosphereic pressure is 748 mm Hg and the air temperature is 28 degrees celcius. It rises to where the atmospheric pressure is 787mm Hg and the temperature
Calculate the pH of a solution prepared by dissolving 0.40g of Na2O in enough water to make 0.600 L of solution? Express your answer using two decimal places.
A sample of gasoline contains various hydrocarbons, which comprise atoms of carbon, hydrogen, and oxygen. The hydrocarbons mix together uniformly to form gasoline. Which term or terms could be used to describe this sample of gasoline?
A sample of helium gas occupies 1045 mL at 621 mmHg. For a gas sample at a constant temperature, determine the volume of helium at 745 mmHg.
Zinc(II) sulfide reacts with oxygen according to the reaction- How many moles of oxygen will be required to react with ZnS
a particle moving 30,816 km/hr has a wavelength of 725 nm. What is the mass of the particle?
An effective treatment for some cancerous tumors involve irradiation with "fast" neutrons. The neutrons from one treatment source have an average velocity of 3.3 x 10^7 m/s
The volume of a gas is 5.0L when the temperature is 5.0C. If the temperature is increased to 10.0C without changing the pressure what is the new volume?
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