Question

Calcula cuántos moles hay en 3g de He.
Considera la masa molar del He como 4g/mol. Explicado.

Answer 1

Mm He = 4 g/mol

Aplicar la fórmula n = m/Mm

n = 3 g / 4 g/mol (eliminar gramos al aplicar la doble c)

n = 0.75 moles

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n He = 3 g He x 1 mol He

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4 g He

n He = 0.75 moles de He