How many moles are in 9.8 grams of calcium?
Answer (3)
According to mole concept, there are 0.245** moles **in 9.8 grams of calcium.
Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Number of moles=mass/molar mass=9.8/40=0.245 moles.
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when the number of moles Ca = mass of Ca / molar mass of Ca .
and we can get the molar mass of Ca, it is = 40 g/mol
and we have already the mass of Ca (given) = 9.8 g
**so, by substitution: the moles Ca = 9.8 g / 40 g/mol **
** = 0.245 moles**
There are approximately 0.245 moles of calcium in 9.8 grams. This is calculated using the molar mass of calcium, which is about 40.08 g/mol. By dividing the mass of calcium by its molar mass, we find the number of moles.
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