paper and plastic
30%
40 percent
Sulfur trioxide (SO3) contains about 40% sulfur by mass.
muscular tissue
The molar mass of NaOH is 40 g/mol. The molar mass of sodium is 23 g/mol. Therefore, the percent by mass of sodium in NaOH is (23 g/mol / 40 g/mol) x 100% = 57.5%.
About 40 percent of bone is made of moisture. Sixty percent of the bone is made of minerals such as calcium.
The Elite
CHEESE ;)
All percentages are in mass% and all quantities are in grams (mass), be sure do not to take volumes into account because mass is 'additive', volumes are not quantitatively additable!Answer: Take whatever mass of 60 percent solution you have, multiply that mass by 20 (=60-40) and then divide that amount by 40, this is how much water to add to get an 40% solution.Example: Suppose you have 100 gram of 60% solution, then you should add:100 * (60-40)/40 = 100*0.50 = 50 gram of water; this is to be added to 100 gram of 60% solution to get (50 + 100 =) 150 gram of 40% solution.(see on top of the page to know why this calculation method is not valid for 'volumes')
Mass percent = Mass of part / Total Mass * 100% Atomic mass of calcium = 40 Molecular mass of calcium bicarbonate = 162 40 / 162 *100 = 24.7% Calcium by weight in a Calcium Bicarbonate Molecule.
About 40 percent of the world's newspapers are printed on paper made in Canada.
I would say about 30, 35 to 40 percent of ocean animals are killed. So sad:*(