Advertisements
Advertisements
प्रश्न
A student puts his signature with a graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
Advertisements
उत्तर
No. of atoms in 12 g C = 6.02 x 1023
∴ no. of carbon atoms in 10−12 g
= `(6.02 xx 10^23 xx 10^-12)/12`
= 5.016 x 1010 atoms
संबंधित प्रश्न
Convert into mole.
12 g of oxygen gas
Fill in the following blanks :
0.5 mole of calcium element has a mass of ............... .
Which of the following pair of elements represents a mole ratio of 1 : 1 ?
The ratio of moles of atoms in 12 g of magnesium and 16 g of sulphur will be :
Explain the term:
Gram mole
Fill in the blank
Avogadro's number is equal to ______
Complete the following calculations. Show working for complete credit :
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of Sulphur. [Atomic masses : S = 32, Ca = 40]
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO2can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.
Find the number of moles in 10 g of CaCO3.
1 mole of any substance contains ______ molecules.
