How many grand or aluminum are there in 6.21 miles of aluminum?
how many grams of calcium carbonate, caco3 are there in 2.87 moles?
how many moles of water, h2o, are there in 133.8 grams?

 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

where are the choice options?