Respuesta :
Answer:
1. mass in gram (Al) = 167.67 g
2. mass in gram (CaCO₃) = 287 g
3. no. of moles (H₂O) = 7.4333 g/mol
Explanation:
Part 1:
How many grams of aluminum are there in 6.21 moles of aluminum?
Data Given:
moles of Al = 6.21 moles
Formula will be used:
no. of moles = mass in gram / molar mass (1)
molar mass of Al = 27 g/mol
put values in equation 1
no. of moles of Al = mass in gram (Al) / molar mass of Al
6.21 mole = mass in gram (Al) / 27 g/mol
mass in gram (Al) = 6.21 mole x 27 g/mol
mass in gram (Al) = 167.67 g
_______________________________
Part 2
How many grams of calcium carbonate, CaCO₃ are there in 2.87 moles?
moles of CaCO₃ = 2.87 moles
Formula will be used:
no. of moles = mass in gram / molar mass
molar mass of CaCO₃ = [M(Ca)+ M(C)+ M(Ox3)] g/mol
molar mass of CaCO₃ = [(40)+ (12)+ (16x3)] g/mol
molar mass of CaCO₃ = 100 g/mol
put values in below equation
no. of moles of CaCO₃ = mass in gram CaCO₃/ molar mass of CaCO₃
2.87 mole = mass in gram ( CaCO₃) / 100 g/mol
By rearranging
mass in gram ( CaCO₃) = 2.87 mole x 100 g/mol
mass in gram (CaCO₃) = 287 g
__________________________
Part 3
How many moles of water, H₂O, are there in 133.8 grams?
Data Given:
moles of H₂O = ?
mass of water = 133.8 grams
Formula will be used:
no. of moles = mass in gram / molar mass
molar mass of H₂O = [(Hx2 )+(O)] g/mol
molar mass of H₂O = [(1x2)+(16)] g/mol
molar mass of H₂O = 18 g/mol
put values in below equation
no. of moles (H₂O) = mass in gram of H₂O / molar mass of H₂O
no. of moles (H₂O) = 133.8g / 18 g/mol
no. of moles (H₂O) = 7.4333 g/mol
