Answer :
Mole measure the number of elementary entities of a given substance that are present in a given sample. 3 mole of Cr are in 156 g of the element. The correct option is option B.
What is mole?
The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, mole and molar mass of chromium can be related as :
number of mole =given mass of chromium÷ molar mass of chromium
Mass of chromium=156 g
Molar mass of 1 mole of chromium= 51.9961 g/mol
Substituting the given values we get,
number of mole =156 g ÷ 51.9961 g/mol
number of mole= 3
Therefore, the correct option is option B. 3 mole of Cr are in 156 g of the element.
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You are given the number of grams of Chromium which is
156 grams. The molar mass of chromium is 52 grams per mole. Divide 156 grams to
52 grams per mole of Chromium and you will get 3 moles of Chromium. The answer is letter B.
