Respuesta :

Stephen46

Answer:

The answer is 0.089 mol

Explanation:

The number of moles of a substance can be found by

[tex]n = \frac{m}{M} [/tex]

where

n is the number of moles

M is the molar mass

m is the mass of the substance

To find the number of moles we must first find the molar mass

Chemical formula for calcium oxide is

CaO

So the molar mass of CaO is

M( CaO) = 40 + 16 = 56 g/mol

Mass of CaO = 5.0g

Substitute the given values into the formula

The number of moles in 5.0g of calcium oxide is

[tex]n = \frac{5 \: g}{56 g/mol} [/tex]

We have the final answer as

n = 0.089 mol

Hope this helps you

FadedElla

[tex] \LARGE{ \boxed{ \pink{ \rm{Answer}}}}[/tex]

☃️ Chemical formulae ➝ [tex]\sf{CaO}[/tex]

How to find?

For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.

[tex] \boxed{ \sf{No. \: of \: moles = \frac{Given \: weight}{Molecular \: weight} }}[/tex]

Solution:

Atomic weight of elements:

  • Ca = 40
  • O = 16

❍ Molecular weight of [tex]\sf{CaO}[/tex]

= 40 + 16

= 56 g/mol

❍ Given weight: 5 g

Then, no. of moles,

⇛ No. of moles = 5 g / 56 g mol‐¹

⇛ No. of moles = 0.089 moles [tex]\approx[/tex] 0.09 moles

⚘ No. of moles of Calcium oxide in the given weight = 0.09 moles approx.

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