1.Calculate the mass of 0, 1 mol of protons. Mass of a proton = 1, 7x10 -27 2.Ca

Question

1.Calculate the mass of 0, 1 mol of protons. Mass of a proton = 1, 7x10 -27

2.Calculates the load of 1 mole-e. Charge of an electron = 1, 6x10 ^ -19

3.Calculate the mass of 10 ^ 20 molecules of sulfur dioxide.

4.How many hydrogen atoms form the molecules contained in 10 cm ^ 3 alcohol C2H5OH (ethanol) Fact: alcohol density = p = 0, 79g/cm3

5.Find the number of ions that are in 5, 0 g of potassium fluoride KF. Data: potassium fluoride as the sodium chloride is an ionic compound.

6.The average diameter of the water droplets is 1-2 mm rain but have come to detect raindrops up to 8 mm. Calculate the number of molecules existing in those giant water drops.Suppose that the temperature of water is 4 c.

Explanation / Answer

0.1 mole = 6.022x10^22 x 1.7x10-27 =1.02374x10-5

load = 6.022x10^23 X 1, 6x10 ^ -19=1.14418X10^4

3.no. of moles =10 ^ 20/ 6.022x10^23=0.000166moles =0.0106

4. 10CM3 HAS 7.9 gms

7.9/46=0.171 moles so there are 5x0.171 moles of hdrogen

=5.171x10^24

5.no. of moles = 5/58=0.086 =5.192x10^22

sso no of ions =2x 5.192x10^22=1.038x10^23

6. volume of drop=2.144cm3

now density = 1g/cm3

so mass = 2.144gm

now ,h20=18 gm/mole

no.of moles of h20=0.119

no. of molecules=7.17x10^22

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