J. Calculate the mass of chloroform that contains 1,000,000,000,000 molecules of

Question

J. Calculate the mass of chloroform that contains 1,000,000,000,000 molecules of CHCl 4. Calculate the number of formula units in 1.37 g of NaCl: chat is, table salt 5. Calculate the number of Na molecules in 0.111 g of nitrogen gas 6, what is the mass of one molecule of stearic acid, 17H35COOH, expressed in grams? 7 Earth's oceans have a surface area of 360,000,000 km2, and a ping-pong ball floating on water occupies a surface area of about 15 cm, Assuming there is no space between ping-pong halls, how many planets similar to Earth would be necessary to float Avogadro's number of ping-pong balls Determination of Avogadro's Number

Explanation / Answer

3) We have 1012 molecules of the CHCl3

We know that 1 mole of CHCl3 contains 6.02 x 1023 molecules

for having 1012 molecules of CHCl3 we need 0.166 x 10-11 moles of CHCl3
1 mole of chloroform = 120 g

0.166 x 10-11 moles = 120 x 0.166 x 10-11 g = 19.92 x 10-11 g

Mass of Chrloroform that contains 1012 molecules = 19.92 x 10-11 g

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