In this exercise you are asked to calculate the enthalpy change of lime burning, using the enthalpy values of the intermediary reactions. The Hess cycle diagram of the limestone cycle is enclosed for assistance. CaCO3 ↔︎ CaO + CO2 △H1 = ???

CaO + H2O = Ca(OH)2 △H2 = -65 kJ/mol

Ca(OH)2 + CO2 = CaCO3 + H2O △H3 = -115 kJ/mol

You have 125g of a certain seasoning and are told that it contains 76.0 g of salt what is the percentage of salt by mass in this seasoning

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.