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)

Number of molecules of water in 6 moles

What is the molarity of a 500-ml solution containing 340 g of KI

Name at least 4 other gases in atmosphere

How dose a plant use food it produces from potosythesis

The modern atomic model includes electrons orbiting the nucleus. which of the following parts of dalton's atomic model was disproved by the discovery of the electron? - atoms are tiny particles. - atoms cannot be divided into smaller parts.

What mass (in mg) does 2.63 moles of nickel have? 3.56 * 105 mg 1.54 * 105 mg 2.23 * 104 mg 129 mg?

Given the propane molecule C3H8 (g) ! a) What is the balanced equation for the combustion of propane in O2? (20 pts.) b) What is the standard enthalpy change ΔH0 for the reaction at 25°C? (20 pts.

Which of the following happens during a chemical change? Check all of the boxes that apply. One atom or more changes into atoms of another element. New substances with different properties are formed. Solids, liquids, or gases may form.

Which has more inertia: a kilogram of cotton balls or a kilogram of gold?

Democritus who lived in greece during the fourth century b. c suggested that matter is made up of tiny particles that cannot be divided. what did he called them