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.