Advertisements
Advertisements
Question
A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g. Calculate the number of carbon atoms in the signature.
Advertisements
Solution
12g of carbon contains = 6.023 x 1023 number of carbon atoms.
10-12g of carbon will contain = `(6.023 xx 10^23 xx 10^(-12))/12`
= 0.5019 x 1011
= 5.019 x 1010
So,the number of carbon atoms in the signature is 5.019 x 1010
APPEARS IN
RELATED QUESTIONS
Calculate the molar mass of the following substance:
Phosphorus molecule, P4 (atomic mass of phosphorus = 31)
Convert into mole.
22 g of carbon dioxide
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
Which of the following would weight the least?
[Atomic masses : Ag = 108, N - 14, O = 16,C = 12]
Calculate the mass of 0.1 mole of the following:
Mg
(Ca = 40, Na = 23, Mg = 24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
Calculate the number of atoms in the following:
52 g of He
Calculate the number of gram atoms in 4.6 gram of sodium.
N2 + 3H2 → 2NH3
(The atomic mass of nitrogen is 14, and that of hydrogen is 1)
1 mole of nitrogen (______ g) +
3 moles of hydrogen (______ g) →
2 moles of ammonia (______ g)
The number of atoms present in 0.1 mole of P4 (at. mass = 31) is ______.
Deduce the number of molecules of the following compound in the given quantity.
90g water
