Answer:
m = 998 g 
Explanation:
Hello there!
In this case, according to the definition of the molar mass as the mass of one mole of the compound, it is possible to state the 1 mole of C8H18 has a mass of 114.26 grams; therefore, the mass in 8.65 moles turn out to be:

In agreement to the notation requirement.
Best regards!
 
        
             
        
        
        
You will need a periodic table to help you answer this problem. The atomic numbers are arrange from lowest to highest in the periodic table. You can locate element number 55 to be Cesium with an atomic weight of 132.905 amu. So, you start from element 56. The following elements are:
56     Barium       137.328 amu
57     Lanthanium   138.905 amu
58     Cerium       140.116 amu
59     <span>Praseodymium    140.908 amu
60     Neodymium   144.243 amu
Neodymium is already greater than 144 amu. Therefore, these elements only include Barium, Lanthanium, Cerium and Praseodymium.</span>
        
             
        
        
        
Answer:
296 L  
Explanation:
We will need a balanced equation with moles, so let's gather all the information in one place.
                   4Al + 3O₂ ⟶ 2Al₂O₃
n/mol:        17.4
1. Moles of O₂

2. Volume of O₂
You haven't given the conditions at which the volume is measured, so I assume it is at STP (0 °C and 1 bar).
At STP the molar volume of a gas is 22.71 L.
 
 
        
             
        
        
        
Answer:
billion is larger \ part if billion
 
        
             
        
        
        
The tool to measure the liquid is a measuring cylinder.