Answer:
2360J
Explanation:
Given parameters:
Mass of aluminum = 25g
Melting point = 658°C
Latent heat of melting = 94.4j/g
Unknown:
Amount of heat require for melting = ?
Solution:
The amount of heat required for this melting will be the product of the mass of the aluminum and the latent heat of melting;
H = m L
m is the mass
L is the latent heat of melting
Insert the parameters and solve;
H = 25 x 94.4 = 2360J
Answer:
4,997.9
Explanation:
just convert fluid ounces to millilters.
Hydropower is electricity generated by harnessing the energy of moving water. This kind or energy provides almost one fifth of the world's electricity.
Answer:
12.19 hours prior to discovery was the corpse placed in the desert.
Explanation:
Heat required for fly eggs to develop into first instar larvae =
From the given,
Exposure time = 16 hrs
Temperature = 27 C
The day time exposed hours is 10 hrs.-(7.00am-5.00pm)
So, the extra heat = 427.2-378= 49.2
The addition heat divided by average temperature.
Average temperature = 22.4 C
So, the total time exposed is night time hours to day time hours.
= 10+2.19 = 12.19 hrs.
Therefore, 12.19 hours prior to discovery was the corpse placed in the desert.
3.84 Kg of sodium chloride is needed to lower the freezing point of the water so that ice melts.
Explanation:
Data given:
mass of ice = 30 Kg
molar mass of NaCl = 58.5 grams/mole
ΔT(depression in freezing point) = 15.4 F or - 9.22 degrees
Kf = 1.86 degree C/ mole
Molality = ?
mass of NaCl =?
i = 2 (because NaCl breaks into 2 ions)
ΔT = iKfm equation 1
Depression in freezing point when ice melts, the temperature is 0 degrees so
the depression in temperature = 9.22 degrees
putting the values in the equation:
9.22 = 2 x 1.86 x x
mass = 3.84 kg of NaCl will be required to lower the freezing point of the water so that the ice melts.