Potassium chlorate decomposes to produce 20 g of solid potassium chloride. oxygen gas is also produced. which best describes the mass of oxygen?

a. it is more than the mass of potassium chloride.
b. it is less than the mass of potassium chlorate.
c. it equals the mass of potassium chlorate.
d. it equals the mass of potassium chloride.

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

Why should the wavelength scale of spectroscope be calibrated