a certain solution or mixture is reported to have a concentration of \"2.90% oxy

Question

a certain solution or mixture is reported to have a concentration of "2.90% oxygen atoms". A student uses 6.50 g of it. How many Mollie of oxygen atoms did this student have? a certain solution or mixture is reported to have a concentration of "2.90% oxygen atoms". A student uses 6.50 g of it. How many Mollie of oxygen atoms did this student have? a certain solution or mixture is reported to have a concentration of "2.90% oxygen atoms". A student uses 6.50 g of it. How many Mollie of oxygen atoms did this student have?

Explanation / Answer

first calculate the mass of O

% mass = (mass of individual / total mass) x 100

2.90 = (mass of O / 6.50) x 100

mass of O / 6.50 = 0.029

mass of O = 0.1885 g

moles of O = 0.1885 / 16 = 0.012

moles of O = 0.012

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