Answer : The mass of the steel bar is, 35.2 grams.
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
where,
= specific heat of steel =
= specific heat of water =
= mass of steel rod = ?
= mass of water =
= final temperature of mixture =
= initial temperature of steel =
= initial temperature of water =
Now put all the given values in the above formula, we get
Therefore, the mass of the steel bar is, 35.2 grams.
Answer:
A. BrF3 > PF5 > CF4
Explanation:
The vapor pressure of a gas is the number of times a given volume of the gas is as heavy as the same volume of hydrogen at a particular temperature and pressure.
The vapor pressure of a gas is related to its relative molecular mass as shown in the formulae:
Vapor pressure =1/2 * relative molecular mass of the gas.
In the question therefore, calculate the relative molecular mass of each of the substance and divide by two, you will get the vapor pressure.
V. P (PF5) = 126/2 = 63
V. P ( BrF3) = 136.9/2 = 68.45
V. P(CF4) = 88/2 = 44
In order of decreasing vapor pressure, BrF3 has high vapor pressure, followed by PF5 and then CF4.
BrF3 > PF5 > CF4
Answer:
L shell is the valence shell
Explanation:
The second shell is L
K,L,M,N
Answer: 3.5e+6 ; 0.0000035
Explanation: Weird question but this is the answer