Consider the following thermochemical equation: B2H6 (g) + 3 O2 (g) ® B2O3 (s) + 3 H2O (g) DHcomb = – 2035 kJ/mol

Calculate the amount of heat released when 10.0 g of diborane (B2H6) is burned.

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.