17. how many moles are there in a sample containing 1000 molecules of h2o? 18. if you wanted a sample of h2o containing 6 x 23molecules, how could you measapproximate number without counting?

17) mol of  = 
                            = 
                            = 1.658  *   

18) mol = 
      
      Let mass of oxygen = x
      
     
             =  17.9 g

Answer : option b) two grams of hydrogen react with one gram of oxygen to form two grams of water.explanation :

the equation for synthesis of water is as follows;

here two moles of hydrogen are used with one mole of oxygen which gives one molecule of water as a product. but shana misinterpreted 2 moles as 2 grams in this equation.

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