Answer:
Explanation: k =10^3, m =10^-3
2.8 Kg = 2.8 *10^3 g
To conver kg to mg you need to
=2.8* 10^3 *10^-3* 10^3
=2.8 * 10^6 *10^-3
= 2.8 * 10^6 mg
Answer:
Friction
Explanation:
Friction is the name of the force that opposes motion.
Answer:
Part A. 2.05 M
Part B. 170.7 L
Explanation:
Part A
For an ideal fluid, we can use the ideal gas law to find out the final molar concentration (C = n/V):
PV = nRT
Where P is the pressure, V is the volume, R is the gas constant (0.08314 bar.L/mol.K), n is the number of moles, and T is the temperature. Thus,
C = P/RT
For T = 20°C + 273 = 293 K
C = 50/(0.08314*293)
C = 2.05 M
Part B
The initial concentration is 1.1 M, so for 1 L of seawater, the volume (V) produced of fresh water is:
Ci/(1 - V) = C
1.1/(1 - V) = 2.05
1.1 = 2.05 - 2.05V
2.05V = 0.95
V = 0.463 L
Thus
1 L ------------ 0.463 L
x ------------- 79.1 L
By a simple direct three rule:
0.463x = 79.1
x = 170.7 L
The change in internal energy for a molecule at 56 g/mol is discovered to be -539 kJ/mol.
The internal energy change of a reaction is represented by the symbol U. U = Heat of calorimeter + Heat of solution for a reaction in the bomb calorimeter.
Heat capacity = Heat Temperature
For example, 0.48 g compound U = 3.81 0.285 + 4.184 3000 0.28 g compound U = 4.67 kJ
For a molecule at 56 g/mol
U equals energy/mass/moles/one, where U = 4.67/0.48556 and U = 539 kJ/mol.
Since the reaction causes a temperature increase, the internal energy, or -539kJ/mol, is given a negative sign.
To know more about internal energy bvisit:-
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I would say the 3rd or 4th one but If I wouldn’t think technology would be necessary for them to do their experiments because they don’t really need technology