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# Three quantum numbers used to describe orbitals in atoms

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1. What is the name of each of the three quantum numbers used to describe orbitals in atoms? what orbital characteristics does each quantum number describe? what are the limitations on the values of these quantum numbers?
2. What is the energy of the photon that is emitted when the state of an electron changes from n=4 to n=2 in a hydrogen atom? (R=3.29 x 10^15 Hz)
3. In a combustion analysis, 2.00mg of vitamin C yielded 3.00 mg of CO2 and 0.816mg of H2O. From mass spectrometry it was found that the molecular weight of vitamin C is 176amu. Determine the mass composition of vitamin C, its empirical formula, and its molecular formula.
4. How many mililitres of 0.480 M NaOH would be required to titrate a 5.00 ml solution of 0.320 M H2SO4?
5. If a gas sample absorbs 89kj of heat and does 120kj of work, what is the change in its internal energy?
6. If the standard enthalpy of formation of methanol CH3OH is -238.6 kj/mol, and CO2(g)= -394 kj/mol, and H2O(l)= -286kj/mol calculate the standard heat of combustion of methanol?

https://brainmass.com/physics/angular-momentum/three-quantum-numbers-describe-orbitals-atoms-294264

#### Solution Preview

Hi there,

1.

There 3 main quantum numbers: n, l and m

n - principal: describes the energy of the orbital
l - angular: describes the directional property of the wavefunction
m - magnetic: describes the orientation of ...

#### Solution Summary

Three quantum numbers used to describe orbitals in atoms are examined.

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