Given these reactions,

X (s) + 1/2 O2 (g) - -> XO (s)

H=-639.7

XCO3 (s) - -> XO (s) + CO2 (g)

H=+349.7

What is H (rxn) for this reaction?

X (s) + 1/2 O2 (g) + CO2 (g) - -> XCO3 (s)

Ar (g) is placed in a 3.80 L container at 320 K. The gas pressure is 0.496 atm.

Which statement is true about the atomic mass? A. It can be greater than the atomic number B. It is never greater than the atomic number C. It always equals the atomic number D. It is always lower than the atomic number

What are 3 examples of ways that humans use this process to increase the value of a plant or animal for humans? (In other words, what are the three types of selective breeding? Briefly describe each one

An atom can be described as a-the smallest particle that has all the characteristics of a compound b-the smallest particle that has all the characteristics of an element c-a charged particle that is similar to a molecule d-a charged particle that is

Five sources of air pollution

How will increasing the pressure on the system affect this equilibrium reaction? 2H2 (g) + O2 (g) - > 2H2O (g)

What are small round structures in the cell that breaks down large food particles into smaller ones

A balloon has a volume of 2.5 L and contains 0.100 moles of Helium. Another balloon has a volume of 5.0 L. They are at the same temperature and pressure. How many moles of gas does the second balloon contain?

Why is it important to that the solid be dry before the final mass measurement?

What is 0.00055030 in Scientific form?