1.

1. Irrespective of the source, pure sample of H2O always contains 88.89% by mass of oxygen and 11.11% by mass of hydrogen. (a) Which law is illustrated here? (b) State the law. 2. Complete the table by filling in the blanks: 48 g O2 1.5 mol O2 ….mL O2​​​​​​​​​​​​ (at STP) … g Na 2 gram atom Na 2NA Na atoms….g CO2 2.5 mol CO2 56 L (at STP) 8.5 g NH3 ……mol NH3 11.2 L (at STP)

Answer»

1. (a) Law of definite proportions. 

(b) The same chemical compound always contains the same elements combined in the same fixed proportion by mass.

2. 

 48 g O2 1.5 mol O2 33600 mL O2​​​​​​​​​​​​ (at STP)
 46 g Na 2 gram atom Na 2NNa atoms
110g CO2 2.5 mol CO2 56 L (at STP)
 8.5 g 
NH3
 0.5 mol NH3 11.2 L (at STP)


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