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Calculate the wavelength of a photon that has an energy of 5.25 times 10-19 J.s in.nm
What is the energy of a photon in joules when an electron in a h atom jumps from n= 6 to n= 5 level.(4)
What is the wavelength of the photon in micrometers(mm) in which region of the spectum is this photon located?
Which of the following correctly represents the second ioniation of Ca
a. CA (g) arrow Ca + (g) + e-
b. Ca+ (g) + e- arrow CA+ (g)
c.Ca+(g) + e- arrow Ca(g)
d. Ca+(g) arrow Ca2+(g) + e-
e. ca-(g) +e- arrow Ca2- (g)
is Ca 3+ possible why or why not
An element has two common isotopes. 98.89% of its atoms have an atomic mass of 12.09 amu, whereas the other 1.11% have an atomic mass of 13.10 amu. Using the isotopic composition provided, calculate the average atomic mass of the element.
How many grams of MgCl2 would be needed to prepare 1.000 L of a solution that is 236 ppm in Mg2+ ions? Note: there is one Mg2+ ion in every MgCl2. Report your answer to the correct number of sig figs.
The heat capacity of the gas, at constant pressure, is 20.8 J/molK. What is the total energy change delta U (in J) for the gas
a gas has a volume of 10 l at 0 degrees c. what is the final temperature of the gas in c if its volume increases to 27
A compound consists of H, C, and O. Combustion of 0.225 grams sample of this compound produces 0.512 grams carbon dioxide and 0.209 grams water. Analysis of this acid indicated a molar mass of 116 g/mole. What is the empirical and molecular formul..
You are given solutions of HCl and NaOH and must determine their concentrations. You use 26.6 mL of NaOH to titrate 100. mL of HCl and 21.4 mL of NaOH to titrate 50.0 mL of 0.0796 M H2SO4. Find the unknown concentrations. NaOH
Hydrogen atoms that are bonded to an sp3 hybridized carbon atom normally appear between 0.9 & 1.8 ppm and are said to be shielded
The Coal is fed with 200% excess water ( excess is calculated with respect to CO formation) 100% of coal is consumed. the selectivity to CO (with respect to CO2) is 1:1 the functional conversion of the CO is 50% what is the final gas composition? ..
What is the percent yield if 5g of anthracene-9-carbaldehyde (MW= 206.24) is used to make 4.8g of 9-strylanthracene
a 33.00 sample of an unknown solution is titrated with a 0.110 solution. the equivalence point is reached when 28.38 of
Multiple choice questions in Nuclear reactions - make nuclear fission more efficient, which device is used in a nuclear reactor to slow the speed
Explain a compound decomposes by a first-order reaction. Explain the concentration of compound decreases from 0.1006M to 0.0810 M in 5.2min. Explain what fraction of the compound remains after 7.0 min
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