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Question 1 0 Which of the following numerical expressions gives the number of moles in 5.0 g of CaO?
A) 5.0 g X 56 g/mol
B) 5.0 g / 56 g/mol
C) 56 g/mol / 5.0 g
D) 1/5.0 g X 1/56 g/mol​

Answer :

Answer: A

Explanation:

samueladesida43

5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.

HOW TO FIND NUMBER OF MOLES:

  • The number of moles in a substance can be calculated by dividing the mass of that substance in grams by its molar mass in grams/moles.

  • Number of moles = mass ÷ molar mass

  • In this question, 5.0g of calcium oxide (CaO) was given. The molar mass of CaO is as follows:

CaO = 40g/mol + 16g/mol = 56g/mol

Number of moles = 5.0g ÷ 56g/mol

Therefore, 5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.

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