It is known that protons and neutrons are made up of smaller particles called quarks.

Each proton and each neutron contain 3 quarks,

What is the approximate number of quarks in 1g of carbon-12?

a. 6x10^23

b. 9x10^23

c. 1.8x10^24

d. 2.16x10^25

i dont understand how its any of these? if 12g of carbon is 6x10^23, how can 1g be any of those? even if it does contain 3 quarks.

i think it should be

12g -------> 6x10^23

1g---------> 6x10^23 / 12

no. of quarks 6x10^23 x 3/12

**0**

# 2002 - Multiple Choice - Q12

Started by someone11, May 24 2006 09:41 PM

1 reply to this topic

### #1

Posted 24 May 2006 - 09:41 PM

### #2

Posted 24 May 2006 - 10:08 PM

A carbon atom has 6 protons (atomic number = 6) and 6 neutrons (subtract atomic number from mass number (12) to get 6).

1 mole of Carbon is 12g, and contains 6x10

In each proton there are 3 quarks, and in each neutron there are 3 quarks, and therefore, in each atom there are (6x3) + (6x3) = 36 quarks.

So in 12g of Carbon, there are 6x10

Therefore in 1g of Carbon, there are 2.16x10

=> C

1 mole of Carbon is 12g, and contains 6x10

^{23}Carbon atoms.In each proton there are 3 quarks, and in each neutron there are 3 quarks, and therefore, in each atom there are (6x3) + (6x3) = 36 quarks.

So in 12g of Carbon, there are 6x10

^{23}x 36 = 2.16x10^{25}quarks.Therefore in 1g of Carbon, there are 2.16x10

^{25}/12 =**quarks.**__1.8x10__^{24}=> C

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