11.
O4 means 4 atoms of oxygen. H2O
has one atom of oxygen, so seven "units" of
H2O has 7.
The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has a weight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.
Answer: The molar mass of A is one fourth that of B
Explanation:
To calculate the rate of diffusion of gas, we use Graham's Law.
This law states that the rate of diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

So,

We are given:
Rate of diffusion of A =
Rate of diffusion of B
Putting values in above equation, we get:



Thus the molar mass of A is one fourth that of B
Answer:
D
Explanation:
i am not sure but we find DNA on ribosones