The total hardness is due to one or a combination of Ca2 , Mg2 , and Fe2 in your sample. It is convenient to express this hardness as though it was entirely due to Ca2 . Making this assumption, determine the number of moles of Ca2 present in the bottled water sample

b. examine and describe cells

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

a electronegativity decreases beacuse the size of nucleus is bigger.