A sample of magnesium is heated in a boiling water bath to 100.0°C. The sample is then placed into a calorimeter with 7.06 g of water. The initial temperature of the water in the calorimeter is 24.9°C and the final temperature is 27.0°C. What is the mass of the magnesium sample?

Calculate the enthalpy of the following reaction: 4 b (s) + 3 o2 (g) → 2 b2o3 (s) given the following pertinent information: (a) b2o3 (s) + 3 h2o (g) → 3 o2 (g) + b2h6 (g), δhoa = +2035 kj (b) 2 b (s) + 3 h2 (g) → b2h6 (g), δhob = +36 kj (c) h2 (g) + latex: \frac{1}{2} 1 2 o2 (g) → h2o (l), δhoc = −285 kj (d) h2o (l) → h2o (g), δhod = +44 kj

Two atoms interact with each other as shown by the equation. complete the equation by filling in the missing parts. 1 2 3 4 5 h he li

When the mercury level in a barometer decreases that atmospheric pressure has