Which reaction is endothermic? ½N 2(g) + 3/2H 2(g) → NH 3(g) + 11.0 kcal H 2(g) + ½ O 2(g) → H 2O(g), ΔH = -57.82 kcal ½N 2(g) + O 2(g) + 8.1 kcal → NO 2(g) C (diamond) + O 2(g) → CO 2, ΔH = -94.50 kcal

Calculate the molarity of the solution. 6.02 x 1022 molecules of hci (molecular weight = 36.5 g/mole) in 2.0 liters of water m

Which of the following methods uses the decay of atomic particles in an object to find its exact age? a. fossil dating b. geologic dating c. radioactive dating d. relative dating

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)