Atomic mass is the number of protons + number of neutrons. 11 protons + 12 neturons = 23
Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
Answer:
controlled by the Arabs, who brought frankincense and myrrh by camel caravan from South Arabia.
Answer: well the answer is a
Explanation: how because I did that
