Answer:
the appearance of shadows changing throughout the day
Answer:
2726.54 J/K
Explanation:
Entropy change = 
where
m = mass of water = 450g = 0.45kg
= 2.26 MJ/kg = 2260000 J/kg
T = temperature at which water change from liquid to steam = 100 degree Celsius = 272 + 100 = 373 degree kelvin.
Entropy change = 
= 2726.54 J/K
Its c because i look it up on quizlet
Answer:
Explanation:
We know that the mechanical advantage of the hammer is is given by the ratio between the force applied on the hammer and the force required to overcome the given force.Force applied = 40 NForce required= 160 NMechanical advantage =Mechanical advantage =
Hence, the mechanical advantage of the hammer is 4.
Answer:
153.9 g/mol
Explanation:
The freezing point depression for an ideal solution is given by the expresion:
ΔTf = Kf m
where:
ΔTf is the freezing point depression
Kf is the freezing constant of the solvent
m is the molalility which mol of solute per kilogram solvent
The moles of solute is the mass divided into its molecular weight, MW
substituting into the equation, we have:
4.49 º C = 6.91 ºC/m x [(1.0 g/MW) / 0.010 kg]
4.49 º C = 6.91 ºC/mol/kg x [(1.0 g/MW) / 0.010 kg]
⇒4.49 = 691 g/mol/MW
⇒ MW = 691 / 4.49 g/mol = 153.9 g /mol
