Citric acid is concentrated in citrus fruits and plays a central metabolic role in nearly every animal and plant cell. How many moles of citric acid are in 4.79 quarts of lemon juice (d=1.09 g/mL) that is 6.85% citric acid by mass?
At the first we need to calculate the mass of cictric acid as "m = \\omega \\rho V" where "\\omega" is the mass fraction, "\\rho" - density and "V" - volume of solution (we shall use "1[{\\text{qt}}] \\approx 946.35[{\\text{mL]}}") thus
Now we need to calculate the molar mass of citric acid (whose chemical formula is "{C_6}{H_8}{O_7}") as the sum of atomic weights (can be found in the periodic table)
Now we can calculate the number of moles
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