[" Two students "X" and "Y" report the mass of the same "],[" substance as "7.0g" and "7.00g" respectively,which of the "]

Two student X and Y report the mass of the same substance as 7.0 g and 7.00 g respectively. Which of the following statement is correct?

Two students X and Y report the mass of the same substances as 7.0 g 7.00 g respectively. Which one of the student is more accurate?

Two students 'x' and 'y' report the weight of the same substance as 5.0g and 5.00g respectively. Which of the following statement is correct.

Visha took two aqueous solutions, one containing 7.5 g of urea (Molar mass = 60 g/mol) and the other containing 42.75 g of substance Z in 100 g of water, respectively. It was observed that both the solutions froze at the same temperature. Calculate the molar mass of Z.

Visha took two aqueous solutions, one containing 7.5 g of urea (Molar mass = 60 g/mol) and the other containing 42.75 g of substance Z in 100 g of water, respectively. It was observed that both the solutions froze at the same temperature. Calculate the molar mass of Z.