When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 21.6 g of carbon were burned in the presence of 72.3 g of oxygen, 14.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

KF is a strong electrolyte, and HF is a weak electrolyte. How is the solution of KF different from that of HF?

Calculate the heat in joules "Q" needed to raise 27.0 g of water from 10.0 °C to 90.0 °C.

What is a subshell? explain why is it important.

A balloon is at a height of 30 meters, and is rising at the constant rate of 5 m/sec. A bicyclist passes beneath it, traveling in a straight line at the constant speed of 10 m/sec.

A container has a volume of 200 L at 0.94 atm and 25 C. The pressure changes to 1.00 atm and the temperature changes to 0 C. What is the new volume of the container

Nitrogen dioxide (NO2) gas and liquid water (H2O) react to form aqueous nitric acid (HNO3) and nitrogen monoxide (NO) gas. Suppose you have 5.0 mol of NO2 and 11.0 mol of H2O in a reactor. Suppose as much as possible of the NO2 reacts.

How long does it take the Earth to rotation and revive

What is Charles' law formula?

Which stars have the highest absolute brightness? Select one: a. Supergiants b. Giants c. Yellow stars d. Dwarfs

What volume would 3.01•1023 molecules of oxygen gas occupy at STP?