Petunia needs 66.48 grams of potassium hydroxide (KOH) to run a reaction in class. How many moles of potassium hydroxide does she need? Please round your answer to two digits after the decimal point, and remember to include correct, complete units (including substance formula).

1.19mole

Explanation:

Given parameters:

Mass of potassium hydroxide , KOH  = 66.48g

Unknown:

Number of moles of KOH = ?

Solution:

To solve this problem, we need to use the expression below;

   Number of moles  =  

Molar mass of KOH = 39 + 16 + 1  = 56g/mol

  Number of moles  =   = 1.19mole

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weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.