Answer: Option (c) is the correct answer.
Explanation:
As density is mass divided by volume.
Mathematically, Density =
So, more is the mass of a substance more will be its density but if volume is low then density will also have a low value.
Molar mass of neon is 20 g/mol.
Molar mass of is 44 g/mol.
Molar mass of is 70.9 g/mol.
Since, molecule has the highest mass. Therefore, its density will also be high.
Thus, we can conclude that out of the given options gas has the highest density.
Answer: a. 79.6 s
b. 44.3 s
c. 191 s
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
b) for completion of 32% of reaction
c) for completion of 81 % of reaction
Answer:-A. It is less than 890 kJ/mol because the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
Explanation: Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and for the reaction comes out to be positive.
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and for the reaction comes out to be negative.
In the formation of new bonds more energy is released than is required to break the existing bonds, heat is released.
In the formation of bonds less energy is released than is required to break the existing bonds, heat is absorbed.
