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Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.
1) n = 4 --> n = 3
2) n = 5 --> n = 1
3) n = 5 --> n = 4
4) n = 6 --> n = 5
A plot o f the reciprocal concentration of chemical A versus time yielded a straignt line with a slope
A flask contains 0.180 mol of liquid bromine, Br_2. Determine the number of bromine molecules present in the flask.
Write the concentration of cations in mEq/L and total the concentration of cations in the solutions. Repeat for anions.
0.5g KCl was dissolved in 100g water and the solution originally at 200C, froze at - 0.240C. Calculate the percentage ionization of salt. Kf per 1000g of water = 1.86K
Assume that aspartame is a molecular solid and does not ionize when it dissolves in water. Kf values are given here.
Consider the reaction: 2 K(s) + 2 H2O(l) -> 2 KOH(aq) + H2(g), DH = ? The heat released when 24.9g of K reacts with excess water is 124 kJ. Determine the enthalpy change, DH, for the above equation as written
At saturation, 3.0 x 10-9 moles of AlPO4 have dissolved in 2 L of water. What is Ksp for AlPO4 at this temperature?
Compute the change in temperature when 2 g of sodium chloride is dissolved in 270.0 mL of water initially at 25 C. The heat capacity of water is 4.184 J/mL/K. Neglect the heat capacity of the NaCl.
How many grams of ice at 0°C and 101.3kPa could be melted by the addition of 0.40kJ of heat? Find the molar heat of fusion.
an acetic acid solution of 2.87 pH is titrated with 1.5 mL of bromocresol green. When the color changes to light green
The 1.000 L flask was filled with gas from the experiment at an atmospheric pressure of 30.57 inches of Hg and a temperature of 24 degrees C.
Consider the reaction Cu2S + O2 → 2Cu + SO2. If 55.0 grams of Cu2S is heated in excess O2, what is the mass of Cu that can be produced?
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