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a laser utilized to read cds emits red light of wavelength 700 nm explain how many photons does it emit each second if
compute the energy per photon as well as the energy per mole of photons of radiation of wavelength a 200 nm ultraviolet
the speed of a certain electron is 995 km s-1 if the uncertainty in its momentum is to be decrease to 00010 per cent
at 23 degrees celsius and 1 atm the density of a gaseous hydrocarbon is 181 g dot l inverse 1 the hydrocarbon isa ch4b
if 250ml of methane ch4 effuses through a small hole in 48 s the time necessary for the same volume of helium to pass
a 550 ml sample of oxygen gas is collected over water at a temperature of 210 degree celsius as well as a pressure of
explain carbon-14 which is present in all living tissue radioactively decays via a first-order process a one-gram
a mixture of 1374 g of h2 and 7031 g of br2 is heated in a 200-l vessel at 700 k these substances react as follows h2 g
while doing sn2 chemistry- synthesis of 1-bromobutane from butan-1-ol why would the crude product likely contain
the question is asking is ionic equation and net ionic equation diring force type and reaction for the
if 335 g of cuno32 are obtained from allowing 225 g of cu to react with excess hno3 explain what is the percent yield
name and depict the structures of six compounds that have the formulac6h7n a five or a six membered ring and are
name and depict five compounds that have the formulac7h7br a six or seven membered ring and are
a cargo ship of 455 ft length 62 ft beam and 38 ft depth deck to keel has been loaded so much that it displaces
350ml of 0255 m nitric acid is added to 450ml of 0328 mmg no32 explain what is the concentration of nitrate ion in the
how much filtered 50 naoh in ml must be added to 20liters of boiled deionized water to give an approximately 018 m
if a 250ml solution of ethanol in water is prepared with 4ml of absolute ethanol explain what is the concentration of
compute the number of mill moles in 500 mg of each of the following amino acids alanine mw89 leucine 131 tryptophan 204
from the equation hcl naoh rarr nacl h2o compute the number of moles of base that are used in the neutralization
the absorption spectrum of a solution that contains chromium iii ions demonstrate two maxima one at about 400nm and the
explain how many electrons in an atom can have each of the following quantum number or sublevel designations a 2s
explain how many kilograms of chlorine are in 25 kg of each of the following chlorofluorocarbons cfcsa cf2cl2b cfcl3c
a 290-mol of n2 occupies 750 l at 095atm and 26 deg celsius explain what volume will be necessary to contain a mixture
the incomplete pressures of ch4 n2 and o2 in a sample of gas were found to be 100 450 and 200 mmhg respectively compute
a gas occupies a volume of 150l at 700 mmhg and 200 deg celsius explain what is the volume at 400mmhg at 100 deg