Answer : The correct answer for mass of material = 26.6 Kg
Given : Q = 4720 KJ
Change in Temperature ( ΔT ) = 65 K
Specific heat capacity of material ( c) = 2730
The relation between Q , ΔT , c and m are related by following formula :
Q = m* c*ΔT ,
where Q = Heat or energy absorbed or released
m = mass , c = specific heat ,ΔT = change in Temperature
Plugging value in heat formula :
[[Converting
]]
Dividing both side by
m = 26.6 Kg
Answer:
Movement of water within the earth and atmosphere
Explanation:
The water cycle is the continuous movement of water within the earth and atmosphere
Answer:
The molarity of urea in this solution is 6.39 M.
Explanation:
Molarity (M) is <em>the number of moles of solute in 1 L of solution</em>; that is
To calculate the molality, we need to know the number of moles of urea and the volume of solution in liters. We assume 100 grams of solution.
Our first step is to calculate the moles of urea in 100 grams of the solution,
using the molar mass a conversion factor. The total moles of 100g of a 37.2 percent by mass solution is
60.06 g/mol ÷ 37.2 g = 0.619 mol
Now we need to calculate the volume of 100 grams of solution, and we use density as a conversion factor.
1.032 g/mL ÷ 100 g = 96.9 mL
This solution contains 0.619 moles of urea in 96.9 mL of solution. To express it in molarity, we need to calculate the moles present in 1000 mL (1 L) of the solution.
0.619 mol/96.9 mL × 1000 mL= 6.39 M
Therefore, the molarity of the solution is 6.39 M.
Mình nghĩ C là đáp án đúng