What condition of the gas remains constant?

A volume of 18.0 L contains a mixture of 0.250 mole N 2, 0.250 mole O 2, and an unknown quantity of He. The temperature of the mixture is 0 ∘ C, and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture?

The rate law for a hypothetical reaction is rate = k [A][B]. If the concentrations of A and B are both 0.020 moles per liter and k = 1.3 * 10-1 M-1s-1, what is the reaction rate? a. 4.0 * 103 M b. 1.3 * 10-1 M-1s-1 c. 5.2 * 10-5 Ms-1 d. 5.

1. What is the molar mass of Aspirin (C9H8O4) ? If you have 360.4 grams of Aspirin, how many moles of Aspirin do you have? How many Aspirin molecules do you have? How many carbon atoms do you have?

What kind of energy is required for a chemical reaction?

A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?

Why is there no change in the temperature when the process of melting takes place?

Summarize the acid-base behavior of the main-group metal and nonmetal oxides in water. How does oxide acidity in water change down a group and across a period?

What is an atom?

Sodium will react with oxygen to form sodium oxide. use the formula below to determine how many grams of sodium oxide will be formed if 46 grams of sodium are used in the reaction.

How many atoms in 2.8 mol of neon?