The mass of the human heart is about 1.05?
The average hearth weights 300 grams. It is generally heavier in males than in females. Also, note that there will be a variation depending on the body mass of the person (i.e. people with a larger body mass will have a larger heart). A heart size in excess of 350 grams in females or 375 grams in males is an indicator of hypertrophy (enlargement of the heart).
% by mass is the mass of the solute divide by the total mass of solution times 100%. Or put another way, % by mass = mass solute/total mass of soln (x100%).Mass solute = 4.35 g Mass of solution = 4.35 g + 105 g = 109.35 g (assuming a density of 1g/ml for water) % NaCl by mass = 4.35 g/109.35 g (x100%) = 3.98 % (to 3 significant figures)