Given these reactions:

NO (g) + O3 (g) →NO2 (g) + O2 (g), ΔH=-199kJ

O3 (g) →32O2 (g), ΔH=-142kJ

O2 (g) →2O (g), ΔH=+495kJ

What is the ΔH for this reaction?

NO (g) + O (g) →NO2 (g)

Unstable elements tend to combine with other elements to form

If you have 5.2 moles of iron (Fe) how many grams do you have?

A sample of a uranium compound is found to be losing mass gradually. Explain what is happening to the sample.

Find the normality of the solution containing 5.300 g/L of Na2CO3?

Sodium hydroxide (NaOH) and hydrochloric acid (HCl) react to form sodium chloride (NaCl) and water according to the equation: NaOH + HCl → NaCl + H2O What mass of water forms when 2.75 * 10-4 mol NaOH reacts completely? 2.75 * 10-4 mol NaOH = g H2O

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?

What does berkelium react with

Classifying living things