Question

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How many molecules are there in 2g MgO?(Mg=24,O=16)​

Answer 1

Answer:

No of moles=Given mass/Molecular mass

given mass=2g, molar mass of MgO=24+16=40g

No of moles=2g/40g=0.05 or  5x10^-2

Explanation:

Answer 2

The number of molecules in 2 grams MgO are 3.011 X 10²².

• The molecular mass of MgO is 24 + 16 = 40 g/mol.
• Number of moles of MgO = Given weight/Molecular mass = 2/40 = 1/20 moles.
• To calculate the number of molecules, we can use the following formula: No. of molecules = No. of moles * Avogadro number

                                     = (1/20) * 6.022 * 10²³

                                     = 3.011 * 10²²