1.

Complete the table Element/Compound Molecular MassMass in gramsGMMNo.of moleculesHydrogen H2Oxygen O2Nitrogen N2Water H2OAmmonla NH3 2322818172g32g28g18g17g1GMM1GMM.........1GMM6.022 x 1023 H2 molecules6.022 x 1023molecules.....6.022 x 1023H2O molecules1GAM sodium means 23g sodium. This contains 6.022 × 1023 atoms. If so, how many GAM is present in 69 g sodium? How many atoms are present in it?

Answer»
 Element/Compound Molecular MassMass in gramsGMMNo.of molecules
Hydrogen H2
Oxygen O2
Nitrogen N2
Water H2O
Ammonla NH3
 2
32
28
18
17
2g
32g
28g
18g
17g
1GMM
1GMM
1GMM
1GMM
6.022 x 1023 H2
6.022 x 1023O2
6.022 x 1023 N2
6.022 x 1023 H2O 6.022 x 1023NH3

\(\frac{69}{23}\) = 3 GAM,

3 x 6.22 x 1023 sodium atoms.


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