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How to calculate ppm of caco3 in water2/14/2023 Subtract 11.19 from 100 to get 88.81 percent. From the calculation above, you know the percentage of hydrogen is 11.19 percent, and water has only hydrogen and oxygen, so the two added together must equal 100 percent. You can use two methods to find the mass percent of oxygen in water. Multiply 0.1119 by 100 to get the answer: 11.19 percent. To find the mass percent of hydrogen in water, take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100. The atomic mass of oxygen is 16.00, and the molecule has only one oxygen atom, so oxygen’s total mass remains 16.00. Because the molecule has two hydrogen atoms, multiply 1.008 by 2 to get 2.016. The atomic mass of hydrogen taken from the periodic table is 1.008.
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