Home
Class 12
CHEMISTRY
If the atomic weight of carbon is set at...

If the atomic weight of carbon is set at 24 amu, the value of the avogadro constant would be :-

A

`6.022xx10^(23)`

B

`12.044xx10^(23)`

C

`3.011xx10^(23)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
1 a.m.u =` (1)/(12)xx "wt of" C - 12` isotope
1 a.m.u `= (1)/(24)xx wt of C-12` isotope
1 amu `= 2xx1 amu^(1)`
New `"amu"^(1)= ("amu")/(2)`
Promotional Banner

Similar Questions

Explore conceptually related problems

In above case, if instantaneous value of electric field at a given point on the direction of propagation of wave is 24hat(i)(N)/(C ) then find magnetic field at the same point at the same instant. What would be its frequency of oscillations ?

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are ""_(12)^(24)Mg (23.98504u), ""_(12)^(25)Mg (24.98584u) and ""_(12)^(26)Mg (25.98259u) . The natural abundance of ""_(12)^(24)Mg is 78.99% by mass. Calculate the abundances of other two isotopes.

A ship is moving at a constant speed of 10 km//hr in the direction of the unit vector hat(i) . Initially. Its position vector, relative to a fixed origin is 10(-hat(i)+hat(j)) where hat(i) & hat(j) are perpendicular vectors of length 1 km. Find its position vector relative to the origin at time t hours later. A second ship is moving with constant speed u km//hr parallele to the vector hat(i)+2hat(j) and is initially at the origin (i) If u=10 sqrt(5) km//h . Find the minimum distance between the ships and the corresponding value of t (ii) Find the value of u for which the shipd are on a collision course and determine the value of t at which the collision would occur if no avoiding action were taken.

Given below are densities of some solids and liquids. Give rough estimates of the size of their atoms : [Hint : Assume the atoms to be 'tightly packed' in a solid or liquid phase, and use the known value of Avogadro's number. You should, however, not take the actual numbers you obtain for various atomic sizes too literally. Because of the crudeness of the tight packing approximation, the results only indicate that atomic sizes are in the range of a few Å].

The diagram Fig.12 shown a piece of pure semiconductor S in series with a variable resistor R, and a source of constant voltage V. Would you increase or decrease the value of R to keep the reading of ammeter constant, when semi-conductor S is heated? Give reason.

A student performed the experiment of determination of focal length of a concave mirror by u-v method using an optical bench of length 1.5 meter. The focal length of the mirror used is 24 cm. The maximum error in the location of the image can be 0.2 cm. The 5 sets of (u,v) values recorded by the student (in cm) are: (42,56),(48,48),(60,40),(66,33),(78,39) . The data set (s) that cannot come from experiment and is (are) incorrectly recorded, is (are)

2xx 10^(8) atoms of carbon are arranged side by side caculate the radius of carbon atom if the length of this arrangement is 2.4 cm .