Verified answer

a. = 47.846 g

b. = 413.9 g

Further explanation

Mole itself is the number of particles contained in a substance  

1 mole = 6.02.10²³ particles  

Mole can be determined if the amount of substance mass and its molar mass is known  

Given

a. 0.520 mol of N2O4

b. 1.63mol of C6H4Br2​

Required

The mass

Solution

a. molar mass of N2O4  : 92,011 g/mol

The mass :

= mol x molar mass

= 0.52 x 92.011

= 47.846 g

b. molar mass of C6H4Br2​ : 235.9 g/mol

the mass :

= 1.63 x 235.9

= 413.9 g

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