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what is the mass of 2.50 mol of Ca?

Sagot :

Indrawboyidn

The mass of 2.5 mol of Ca = 100 grams

Further explanation

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule

So looking for moles we can search in 2 ways

  • 1 . Avogadro's number

N = number of gas particles

No = Avogadro number (6.02.10²³)

n = number of moles

[tex]\rm n=\dfrac{N}{No}[/tex]

  •  2. Molar mass

m = mass

M = relative molecular mass

[tex]\rm n=\dfrac{m}{M}[/tex]  

In solution, moles can also be obtained from the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\rm n=M\times V[/tex]

mol of Ca = 2.5

Atomic mass (Ar) Ca = 40 g/mol

then

[tex]\rm mass~Ca=mol\times Ar~Ca\\\\mass~Ca=2.50\times 40\\\\mass~Ca= \boxed{\bold{100~grams}}[/tex]

Learn more  

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