Replicate water samples are analyzed for water hardness with the following results: 102.2, 102.8. 103.1 and 102.5ppm CaCO3. Calculate:-
(a) The standard deviation
(b) The relative standard deviation
(c) The standard deviation of the mean
(d) The relative standard deviation of the mean.​

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.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

What is one real world example of a colligative property?