Answer:
Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. When you add table salt (sodium chloride, NaCl) to water, the salt dissolves into ions, Na+ and Cl-. The volume increases by a small factor, but the mass increases by a bigger factor.
Explanation:
 
        
             
        
        
        
Answer:
30.0 mol CO₂
Explanation:
 C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
To answer this problem we need to convert moles of C₃H₈ into moles of CO₂: We'll do that by using the <u>stoichiometric coefficients</u>, using a conversion factor that has C₃H₈ moles in the denominator and CO₂ moles in the numerator:
10.0 mol C₃H₈ *  = 30.0 mol CO₂
 = 30.0 mol CO₂
 
        
             
        
        
        
Answer: 0.123 M
Explanation:
According to the neutralization law:

where,
 = molarity of
 = molarity of  solution = ?
 solution = ?
 = volume of
 = volume of  solution = 15.00 ml
 solution = 15.00 ml
 = molarity of
 = molarity of  solution = 0.100 M
 solution = 0.100 M
 = volume of
 = volume of  solution = 18.44 ml
 solution = 18.44 ml
 = valency of
 = valency of  = 1
 = 1
 = valency of
 = valency of  = 1
 = 1


Therefore, the concentration of the unknown HBr solution is 0.123 M