Answer:
20.27 mol
Explanation:
454 L x (1 mol/22.4 L) = 20.27 mol
Answer : The freezing point of a solution is 
Explanation : Given,
Molal-freezing-point-depression constant
= 
Mass of urea (solute) = 29.82 g
Mass of solvent = 500 g = 0.500 kg
Molar mass of urea = 60.06 g/mole
Formula used :

where,
= change in freezing point
= freezing point of solution = ?
= freezing point of solvent = 
i = Van't Hoff factor = 1 (for urea non-electrolyte)
= freezing point constant = 
m = molality
Now put all the given values in this formula, we get


Therefore, the freezing point of a solution is 
11.
c, because the object is not in direct contact to anything with gravity
Density- The proportion of mass to volume of an object.
<span>Density determines what floats and what sinks. More dense sinks less dense will float.</span>
Answer:
SI unit: kg/m³
but g/cm³ is commonly used
Explanation: