General Chemistry Answers

Activation energy of a decomposition reaction is 14.40 kJ-mol-? It is known that rate constant at 553 K equals 3.5 x 10-2 s-?, How to adjust the temperature if the decomposition ratio is 90% in 12 minutes? A. 353K B. 1440k C. 553k D.313K

When electrons move from one electronic energy level to another, a specific amount of energy is either absorbed or emitted, depending on the direction of the transition.

Calculate the wavelength of the photons emitted by hydrogen atoms when they undergo transitions from n = 4 to n = 3.

Sulfur trioxide, SO₃, is made from the oxidation of SO₂, and the reaction is represented by the equation:

2SO₂ + O₂  ®  2SO₃

A 21-g sample of SO₂ gives 18 g of SO₃. The percent yield of SO₃ is        .

Select one:

You have ice at 263 K (-10.0 oC) and 1.0 atm. What could you do to make the ice sublime? 

 The nutritional information for a candy bar states that oneserving contains 11.0 g of fat and 100 Calfrom fat (1 Cal =1 kcal). Is this information consistent with your answer in part (c)?

A gas sample occupies a volume of 12.0 L at 50 ̊C and 700 torr. How

many moles of gas are contained in the sample?

1.0 mole of a gas occupies a volume of 22.4 L gas at 0 ̊C and 1 atm.

What would be the volume of 7.5 mol of the gas at the same temperature

and pressure?

This is Stoichiometry and I'm struggling badly on this assignment, and I don't understand it well.

Cu + 2H₂SO₄ ---> 2CuSO₄ + SO₂ + 2H₂O