Answer:
16 minutes
Explanation:
First, we need to calculate the amount of heat needed to cool the beef stew:
Q = mcΔT
Where <em>m</em> is the mass, <em>c</em> is the heat capacity and <em>ΔT</em> is the variation of the temperature.
Q = 10x4x(40 - 90)
Q = -2000 kJ
So, the beef stew needs to lost 2000 kJ to cool.
With the initial temperature at 90ºC, the rate of cooling(r) will be:
r = 1.955x(90 - 25)
r = 127.075 kJ/min
So, to lose 2000 kJ, will be necessary:
t = Q/r
t = 2000/127.075
t = 16 minutes
Answer: five carbon atoms forms a ring. In adjacent two carbon atoms
An hydroxyl group (-OH) is attached. Molecular formula is
C5H8(OH)2
Explanation:
Answer:
V = 48.64 L
Explanation:
Given data:
Mass of CO₂ = 85.63 g
Temperature = 273 K
Pressure = 1 atm
Volume of CO₂ = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Number of moles = 85.63 g / 40 g/mol
Number of moles = 2.14 mol
Volume in Litter:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
1 atm× V = 2.14 mol ×0.0821 atm.L/mol.K ×273 K
V = 48.64 atm.L / 1 atm
V = 48.64 L
2 moles
Explanation:
Given parameters:
Mass of Sb = 243.52g
Unknown:
Number of moles = ?
Solution:
The number of moles of any substance can be calculated using the expression below:
Number of moles = 
Molar mass of Sb = 121.76g/mol
Now input the parameters:
Number of moles = 
= 2 moles
learn more:
Number of moles brainly.com/question/1841136
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Answer:
1.66 mins
Explanation:
Distance = 200 m
Speed = 2 m/s
Time taken = 
secs = 1.66 mins
