<u>Answer:</u> The empirical formula of the compound is 
<u>Explanation:</u>
The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
......(1)
Let the mass of the compound be 100 g
Given values:
% of K = 24.7%
% of Mn = 34.76%
% of O = 40.50%
Mass of K = 24.7 g
Mass of Mn = 34.76 g
Mass of O = 40.50 g
To calculate the empirical formula of a compound, few steps need to be followed:
- <u>Step 1:</u> Calculating the number of moles of each element
We know:
Molar mass of K = 39.10 g/mol
Molar mass of Mn = 54.94 g/mol
Molar mass of O = 16 g/mol
Putting values in equation 1, we get:



- <u>Step 2:</u> Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.632 moles



- <u>Step 3:</u> Writing the mole fraction as the subscripts of each of the element
The empirical formula of the compound becomes 
Hence, the empirical formula of the compound is 
Answer:
10 g
Explanation:
The heating of copper can be represented by the following equation:
Cu + 1/2O2 ----> CuO
The new substance is copper oxide, CuO.
<em>From the law of conservation of matter which says that matter can neither be created nor destroyed but be converted from one form to another, it means that barring any loss during heating, all the Cu should be converted to CuO. </em><em><u>Hence, the amount of copper in the new substance should remain 10 g.</u></em>
Answer:
If it is denser then water it shall float but if water has a higher density the object sinks
Explanation:
Look at your periodic table. The answer is D. They are all in Group 15.