Since atoms arc so very small ii is reasonable to expert that their weight vs il

Question

Since atoms arc so very small ii is reasonable to expert that their weight vs ill also be (Go to Panel A on the next page) 2 moles of Hydrogen atoms How many moles of oxygen atoms arc in one mole of H2SO4? (Go to Panel B on the next page) 3 moles of hydrogen atoms weigh 3.03 grams. Now lets extend this from elements to compounds. To calculate the molar mass of a compound, we must first know its chemical formula. W hat is the formula for water? (Go to Panel C on the next page) 2.00 moles of NH3 34.0 g NH3 34.0 g NH3 times 1 mole NH3/17.04g NH3=2.00 moles NH3 Suppose you had 68.0 grams of NHi, how many moles would you have? (Go to Panel D on the next page)

Explanation / Answer

Solution :-

Part A) Since the atoms are very small it is reasonable to expect their weight will also be very small.

Part B) 1 mol H2SO4

How many moles of Oxygen atoms

1 mol H2SO4 contains 4 moles of the oxygen

Because ratio is 1 : 4 for the H2SO4 to oxygen

So the answer is 4 mol oxygen

Part C)

Formula of the water is = H2O

Part D) 68.0 g NH3

Moles of NH3 = ?

Formula to calculate the moles is

Moles = mass / molar mass

Moles of NH3 = 68.0 g / 17.03 g per mol

                         =    3.99 mol NH3

We can round it to the 4.0 mol NH3

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