Answer: Option (d) is the correct answer.
Explanation:
A compound is defined as the substance in which only different atoms chemically combine together in a fixed ratio by mass.
For example, NaCl, HCl, , etc are all compounds.
Compounds are also pure substances like elements as they can be broken down into their constituent particles.
Whereas substances that are made up of only one type of atom are known as elements.
Thus, we can conclude that the most accurate description of compounds is that they are made up of atoms of 2 or more elements that are chemically combined.
Answer:
A) ,
,
A = 1.5×, A = 1.9×
, A=1.5×
B) 4.469
Explanation:
From Arrhenius equation
where; K = Rate of constant
A = Pre exponetial factor
= Activation Energy
R = Universal constant
T = Temperature in Kelvin
Given parameters:
taking logarithm on both sides of the equation we have;
since we have the rate of two different temperature the equation can be derived as:
= 19846.04×7.544×
= 1.497
=
= 4.469
4.648 gm of solute is needed to make 37.5 mL of 0.750 M KI solution.
Solution:
We will start with the Molarity
Also we know 1000 ml = 1 L
Therefore 37.5 ml by 1000ml we obtained 0.0375L
Equation for solving mole of solute
Now, multiply 0.750M by 0.0375
Substitute the known values in the above equation we get
Also we know that Molar mass of KI is 166 g/mol
So divide the molar mass value to get the no of grams.
So 4.648 gm of Solute is required for make 37.5 mL of 0.750 M KI solution.