Answer:
Mole of the H2O = 4.5 
Number of molecules =4.5 multipled by avogadro's number. 
 
        
             
        
        
        
0.370 mol metal oxide = 55.45 g 
<span>1 mol = 55.45/0.370 = 149.86 g </span>
<span>in 1 mol there are 3 mol O = 16 * 3 = 48 g of O </span>
<span>there is 48/149.86 * 100% O in the sample </span>
<span>the sample has 48/149.86 * 0.370 = 0.119 g O</span>
        
             
        
        
        
Mass equals density times volume
Because D=m/v
Multiply by v
Dv=m
        
             
        
        
        
(d) Density of Benzene: 0.8786 g/cm cubed 
(m) Mass: 20.00g 
Formula to solve (v) volume of benzene: V=m/d 
V=20g / 0.8786g/cm cubed 
Answer: Volume of benzene is: 22.8 cm cubed   
Explanation: Well, density is mass divided volume. In this, it is what the volume is. All you need is mass divided by density. Hope this helps!
 
        
             
        
        
        
I'm not sure what the question is, this is a lab proecdure