Mass of 1 mol of CH4 16g No of moleculs in 1 mol Na 60221

Mass of 1 mol of CH4 = 16g

No. of moleculs in 1 mol = Na = 6.022*10^23

therefore mass of 1 molecule = 16/(6.022*10^23) g

Mass of sample, i.e. 2.06 * 10^24 molecules, = (16 * 2.06* 10^24)/ (6.022 * 10^23)

= 54.73 g

Solution