1. if 1 mole of carbon atom is equal to 12g.what is the mass in grams of 1 atom of carbon?

2. if 1g of carbon contain y atoms,what will be the number of atoms in magnesium?  [atomic mass of carbon=12, Mg=24]

3. how many grams of neon will have same no. of atoms containing in 4g of calcium? [mass of Ne=20, Ca=40]

      plzzzzzzzz... answer 2 these questions fast.It's urgent

1. Mass in g of 1 atom of carbon = 12 g/ 6.023x10^23 = 2x10^-23 g.

2. Number of moles of carbon in 1g = 1/12 = 0.083 moles

We know that, each mole contain 6.023x10^23 atoms. Therefore 0.083 moles of magnesium contains 

(0.083) (6.023x10^23) = 0.5019 x10^23 atoms = y (given)

Number of moles of magnesium in 1g = 1/24 = 0.0416 moles.

We know that, each mole contain 6.023x10^23 atoms. Therefore 0.0416 moles of magnesium contains 

(0.0416) (6.023x10^23) = 0.250 x10^23 atoms.

Since given y = 0.5019 x10^23 atoms.

So 0.250 x10^23 atoms of Mg (1g) = y (0.250 x10^23 atoms/0.5019 x10^23 atoms)

   = 0.498 y atoms

3. Number of moles of calcium in 4g = 4/40 = 0.1 moles. Therefore 0.1 moles of calcium contains (0.1) (6.023x10^23) 

= 6.023x10^22 atoms.

Similarly Number of moles of neon is N = m/M *N0, we have to find the mass, hence

m = M/N0 * N  Mass of Ne M = 20; N0 = 6.023x10^23 atoms; here as the number of atoms is same as in calcium so N = 6.023x10^22 atoms

m = (20/6.023x10^23) * (6.023x10^22) = 2 g,

Therefore 2g of neon has the same number of atoms as 4 g of calcium.

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 (a) mole = given mass/molar mass

1 = given mass/ 12

ther4, given mass = 1 * 12

                                      = 12 gms !!

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1.   1 mole of carbon atom = 6.022 * 10 (power 23) carbon atom

6.022 * 10 (power 23) atoms = 12g

1 atom = ?

Criss cross then,

weight of one atom = 1 * 12 / 6.022 * 10 (power 23)

weight of one atom = 1.99 * 10 (power -23)

 

2.  y/2

 

3. 8g

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