Question

1.How many moles of molecules are there in

a)35.5g of chlorine molecules

b)160gof bromine molecules

2.Find the relative atomic mass of Y (L=6.0×10²³) particles per mole.An atom of a certain element Y has mass of 6.5×10²³g

how many molecules are there in

a)0.5moles of oxygen

b)0.15moles of chlorine molecules

c)2moles of nitrogen molecules

4.calc the no of molecules in a)16g of oxygen molecules

b)240g of bromine molecules

c)0.1g of hydrogen molecules

d)106g of chlorine molecules

Answer 1

1.

a) 6,02 * 1023

b) 12,04 * 1023

2.

a) 3,02 * 1023

b) 9,03 * 1022

c) 12,04 * 1023

4.

a) 1

b) 3

c) 0,05

d) 2,986