What is the mass in grams
of 2.25 mol of the element
iron, Fe?

126g

Explanation:

Data obtained from the question include:

Mole of Fe = 2.5moles

Molar Mass of Fe = 56g/mol

Mass of Fe =?

Number of mole = Mass/Molar Mass

Mass = number of mole x molar Mass

Mass of Fe = 2.25 x 56

Mass of Fe = 126g

Therefore, the mass in 2.25mol of Fe is 126g

126g

Explanation:

No of moles = mass given/molar mass

No of moles given=2.25mol

Molar mass of Fe= 56

Mass =?

Substitute the values into the formula

No of moles = mass given/molar mass

2.25= mass/56

Mass= 56×2.25

Mass = 126g

Mass of Fe in 2.25mols is 126g

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

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