Answer:
2:8
Explanation:
The reaction equation is a given as: 
          2C₄H₁₀   +    130₂   →    8CO₂     +     10H₂O  
From the reaction equation, the mole ratio is 2:8
Butane is C₄H₁₀
Carbon dioxide CO₂
From the reaction; 
        2 moles of butane will produce 8 moles of carbon dioxide
 
        
                    
             
        
        
        
Answer:
b consumers eat producers
Explanation:
In a food chain, the consumers are living organisms that eat organisms from a different population. Examples are herbivores like goats.
Producers make their own food in the food chain. Examples are plants.
The relationship between consumer and producers is hence that consumers consume / eat producers. Goats eat grass.
The correct option is;
b consumers eat producers
 
        
             
        
        
        
Answer:
4.90 x 10 24 atoms
Explanation:
the 24 is the exponent for the 10
 
        
             
        
        
        
To find average atomic mass you multiply the mass of each isotope by its percentage, and then add the values up.
35 * 0.90 + 37 * 0.08 + 38 * 0.02 = 35.22
Average atomic mass closest to 35.22 amu.