To find the number of moles of each element present in 100.0 g of
2-deoxyribose, you can use the following steps:
Calculate the molar mass of 2-deoxyribose by summing the molar
masses of its constituent elements (C, H, and O). You can find the molar masses
of elements on the periodic table:
Carbon (C): 12.01 g/mol
Hydrogen (H): 1.01 g/mol
Oxygen (O): 16.00 g/mol
Now, calculate the molar mass of 2-deoxyribose:
Molar mass of 2-deoxyribose = (12.01 g/mol x 44.77%) + (1.01 g/mol
x 7.52%) + (16.00 g/mol x 47.71%)
Calculate the molar mass of 2-deoxyribose:
Molar mass of 2-deoxyribose = (0.4477 x 12.01 g/mol) + (0.0752 x
1.01 g/mol) + (0.4771 x 16.00 g/mol)
Molar mass of 2-deoxyribose ≈ 5.395 g/mol
Now, you can calculate the number of moles of each element in 100.0
g of 2-deoxyribose using their respective percentages in the compound.
Moles of Carbon (C) = (44.77% / 100) x (100.0 g / 5.395 g/mol)
Moles of Hydrogen (H) = (7.52% / 100) x (100.0 g / 5.395 g/mol)
Moles of Oxygen (O) = (47.71% / 100) x (100.0 g / 5.395 g/mol)
Now, calculate each of these:
Moles of C = (0.4477 / 5.395) x 100.0 ≈ 8.29 moles of C
Moles of H = (0.0752 / 5.395) x 100.0 ≈ 1.39 moles of H
Moles of O = (0.4771 / 5.395) x 100.0 ≈ 8.84 moles of O
So, in 100.0 g of 2-deoxyribose, there are approximately 8.29 moles
of carbon (C), 1.39 moles of hydrogen (H), and 8.84 moles of oxygen (O).
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