Chemistry. The mole concept practice.
1) How many moles are in the following?
a) 1.29 x 1024 hydrogen atoms in HF
b) 7.36 x 1024 free oxygen atoms
c) 3.28 x 1023 Na atoms in salt (NaCl)
2) How many atoms are present in the following?
a) Hydrogen atoms in 3.14 mol of H2O
b) Nitrogen atoms in 2.79 mol of NH3
c) Oxygen atoms in 4.90 mol in Al2O3
3) How many atoms are in a 3.56 g sample of Cu? Is this a mol of Cu?
4) What mass of Ni has as many atoms as there are N atoms in 63.0 g of NO2?
5) How many g of CaCO3 are present in a sample if there are 4.52 x 1024 atoms of carbon
in that sample?
6) Calculate the number of moles in each of the following masses:
a) 64.1 g of aluminum
b) 28.1 g of silicon
c) 0.255 g of sulfur
7) Calculate the mass of each of the following amounts:
a) 1.22 mol sodium
b) 14.5 mol copper
c) 0.275 mol mercury
8) Calculate the amount in moles in each of the following quantities:
a) 3.01 x 1023 atoms of rubidium
b) 8.08 x 1022 atoms of krypton
c) 5 700 000 000 atoms of lead
d) 2.997 x 1025 atoms of vanadium
9) Calculate the number of atoms in each of the following amounts:
a) 1.004 mol bismuth
b) 2.5 mol manganese
c) 0.000 000 2 mol helium