where is the diagram?
without the diagram i can't help 
 
        
             
        
        
        
Answer:
The answer is Sodium Sulfate = Na2SO4  
Explanation:
Molar mass of sulfate = 1 (S) + 4 (O) = 1 (32) + 4 (16) = 32 + 64 = 96  
Molar mass of sodium sulfate = 2 (23) + 96 = 46 + 96 = 142  
% of Sulfate = (96/142)*100 = 67.6%  
Percent mistake in Studen A,  
(I) % mistake = (67.6 - 68.6)/67.6 = 1.48  
(ii) % mistake = (67.6 - 66.2)/67.6 = 2.07  
(iii) % mistake = (67.6 - 67.1)/67.6 = 0.74  
For understudy B  
(I) % mistake = (67.6 - 66.7)/67.6 = 1.33  
(ii) % mistake = (67.6 - 66.6)/67.6 = 1.48  
(iii) % mistake = (67.6 - 66.5)/67.6 = 1.63  
Sutdent An is some how exact.  
Understudy B is exact however not precise.
 
        
             
        
        
        
 The arrangement of the elements in order of decreasing metallic character is: Rb, Zn, P, S, F, Ca, Co, Cr
<h3 /><h3>What are metals?</h3>
Metals are elements which are known by their special ability to form ions by a loss of electrons.
The increasing metallic character of metal is a measure of their ability to lose electrons.
Metallic character increases from right to left and down a group in the period table.
Metals are found to the left of the period table. 
In conclusion, metals are known by their ability to lose electrons.
Learn more about metals at: brainly.com/question/25597694
#SPJ1
 
        
             
        
        
        
We can see that 2 moles of The no react with 1 mole of O2 using this equation. 4.8 L NO x 1 L O2 / 2 L NO = 2.4 L of O2 are needed at constant pressure and temperature.
What is an example of pressure?
One can see a simple illustration of pressure by using a knife against a few fruit. If you press the flat side of the knife against the fruit, the top won't be cut. The force is spread more than a wide area (low pressure).
What are different types of pressure?
The physical pressure exerted to an object is referred to as pressure. Per unit area, a parallel force is applied to the surface of the objects. F/A (Force per Area) is the basic formula for pressure.
To know more about pressure visit:
brainly.com/question/12971272
#SPJ4
 
        
             
        
        
        
Answer:
It is the last one.
Explanation:
Water molecules are polar, they have cohesive properties, and water is less dense when it is solid than when it is a liquid, that is why ice floats in liquid water. However, water is a very good solvent, it can dissolve many solids, including sugar, salt, and other hydrophilic substances.