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To do this, you need to know the atomic weight of the element you're dealing with, found on any Periodic Table. The atomic weight is the mass in grams of the element in one mole - this will provide you with a conversion factor. So take the measurement in grams and divide it by the atomic weight to convert to moles. Really what you're doing is multiplying the number by 1 mole, and dividing it by the equivalent of one mole, the atomic weight. That's the thought process behind unit analysis and how you get your "units to cancel".
In this case, the answer is about .25 moles B.

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14y ago
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11y ago

You need the equation mass = Mr x Moles.

So 3 x 16(Mr of Oxygen atom) = 48.

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6y ago

Four grams of oxygen contain 0,752767.10e23 atoms.

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15y ago

What is the mass of 4.0 liters of oxygen?

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13y ago

32*4=128gm.

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Q: What is the mass of 4.0 liters of oxygen?
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