Question

Calcule o número de mols em:
a. 127 g de Cu
b. 0,012 g de K
c. 6,75 g de Al
d. 24 g de CH4

Answer 1

a) Massa molar do cobre ( Cu ) => 63,5 g/mol

1 mol ------------ 63,5 g
n mol ------------ 127 g

n = 127 / 63,5

n = 2,0 mols
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b) Massa molar do potássio ( K ) = 39 g/mol

1 mol ------------------- 39 g
n mol --------------------0,012 g

n = 0,012 / 39

n = 3,07.10⁻⁴ mols
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c) Massa molar do alumínio ( Al ) = 26,98 g/mol

1 mol ------------------ 26,98 g
n mol ------------------ 6,75 g

n = 6,75 / 26,98

n = 0,250 mols
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d) Massa molar do metano ( CH4) = 12 +1 x 4 => 16 g/mol

1 mol --------------- 16 g
n mol --------------- 24 g

n = 24 / 16

n = 1,5 mols
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