Question

1) Qual é a massa, em gramas, de uma molécula de etano (C2H6):

a) 18 g.

b) 30 g.

c) 6,0 . 1023.

d) 5,0 . 10-23.

e) 0,2 . 1023.

• Alguém me ajuda por favor!!!

• Necessita de Regra de 3 apresentando passo a passo!!!
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Answer 1

$\mathsf{C_{2}H_{6}}\\\mathsf{1\,mol\,de\, mol\'eculas\,de\,C_{2}H_{6}}\\\mathsf{6\times{10}^{23}\,mol\'eculas\,de\,C_{2}H_{6}}\\\mathsf{4\,mols\,de\,\'atomos\,de\,C_{2}H_{6}}\\\mathsf{4\times6\times{10}^{23}\'atomos\,de\,C_{2}H_{6}}\\\mathsf{30g/mol}}$

$\mathsf{6\times{10}^{23}\,mol\'eculas\to~30g}\\\mathsf{1\,mol\'ecula\to~x}\\\\\mathsf{x=\dfrac{30}{6\times{10}^{23}}}\\\huge\boxed{\boxed{\mathsf{x=5\times{10}^{-23}\,g}}}$

Answer 2

Alternativa "d", 5,0 . 10-23.