'the vapour density of certain gas x is 4 times that of y the molecular mass of x is m the molecular mass of y is ?'
To find the molecular mass of gas y, we need to use the given information that the vapor density of gas x is 4 times that of gas y.
Vapor density is defined as the ratio of the mass of a given volume of a substance to the mass of an equal volume of a reference substance (usually air). Mathematically, it can be expressed as:
Vapor density (D) = (Molar mass of the substance) / (Molar mass of the reference substance)
Let's assume the molar mass of gas y is M(m). Since the vapor density of gas x is 4 times that of gas y, we can write the equation:
4 = (Molar mass of x) / (Molar mass of y)
Since the molecular mass of gas x is given as 'm', we can substitute it into the equation:
4 = m / M(m)
Now, let's solve for M(m):
4 * M(m) = m
M(m) = m / 4
Therefore, the molecular mass of gas y (M(m)) is equal to m divided by 4.
I don't know what definition your prof is using. In relation to H2 or in relation to air. If H2 it is this.
dx = 4dy
Mx = 8dy so if Mx = m, then My is 8m.