zoebenally4526
24.08.2019 •
Chemistry
How many moles are in 15.0 grams of calcium?
0.374 moles
2.67 moles
601.5 moles
2.40 x 1025 moles
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Ответ:
Ca atomic mass = 40.1 g / mol
Now use the formula:
mass = #moles * atomic mass, and solve for #moles
#moles = mass / atomic mass = 15.0g / 40.1g/mol = 0.374 mol
0.374 moles
Ответ:
mol(C) : mol(H) : mol(O) = 6 : 12 : 3 = 2 : 4 : 1
The empirical formula is C2H4O.