Advertisements
Advertisements
प्रश्न
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
उत्तर
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
संबंधित प्रश्न
Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?
Which of the following pair of elements represents a mole ratio of 1 : 1 ?
Explain the term:
Mole
Fill in the blank
Avogadro's number is equal to ______
Consider the following reaction and based on the reaction answer the questions that follow :
\[\ce{(NH4)2Cr2O7 ->[heat] N2(g) + 4H2O(g) + Cr2O3}\]
Calculate :
(i) The quantity in moles of (NH4)2Cr2O7 if 63 gm of (NH4)2Cr2O7 is heated.
(ii) The quantity in moles of nitrogen formed.
(iii) The volume in litres or dm3 of N2evolved at STP.
(iv) The mass in grams of Cr2O3 formed at the same time
[Atomic masses : H = 1, Cr=52, N=14]
Calculate the number of moles of CO2 which contain 8.00 g of O2
How many grams are there in the following?
2 moles of the hydrogen molecule, H2.
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight.
- Whose container is heavier?
- Whose container has more number of atoms?
Deduce the number of molecules of the following compound in the given quantity.
8.8g carbon dioxide
