Question

How many moles in 6.4 g of H2O?

46 mol

124 mol

.025 mol

.36 mol

Answer 1

Explanation:

Given

Weight of Water (H2O) = 6.4 gms

To find

Number of moles of water = ?

Solution

we know that molar mass of H2O = 18 g

Now,

$Number \: of \: moles =\frac{Given \: weight \: of \: substance}{molar \: mass \: of \: substance}$

Number of moles = 6.4/18 = 0.355~ 0.36 moles

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Answer 2

Answer:

Explanation:

h2o   =  18 gmol-1

             1mol =18 g

             18 g  =1mol

             6.4g =1/18*6.4

                      = 0.355

                      =0.36mol