Answer: This is true
Explanation: v2=800/25= 32m/s
d. 110 grams
Explanation:
The number of grams needed to make 1molar solution from 1liter volume is 110grams.
Concentration is the number of moles of solute dissolved in a given volume of solvent.
Since:
desired concentration = 1M
volume = 1L
Number of moles = ?
Concentration =
Number of moles = concentration x volume
Number of moles = 1 x 1 = 1mole
Mass of CaCl₂ = number of moles x molar mass
Molar mass CaCl₂ = 40 + (35x 2 ) = 110g/mol
learn more:
Molar mass brainly.com/question/2861244
#learnwithBrainly
Mass of CaCl₂ = 1mole x 110g/mole = 110g
Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge. From the optics the focal length of the mirror can be defined as the radius of the mirror divided between two, or in other words, half the radius of the mirror.
Therefore the focal length of the mirror is 17cm
Answer:
Explanation:
The question is incomplete.
The equation of motion is given for a particle, where s is in meters and t is in seconds. Find the acceleration after 4.5 seconds.
s= sin2(pi)t
Acceleration = d²S/dt²
dS/dt = 2πcos2πt
d²S/dt² = -4π²sin2πt
A(t) = -4π²sin2πt
Next is to find acceleration after 4.5 seconds
A(4.5) = -4π²sin2π(4.5)
A(4.5) = -4π²sin9π
A(4.5) = -4π²sin1620
A(4.5) = -4π²(0)
A(4.5) = 0m/s²
Answer: The boiling point of solution is
Explanation:
Elevation in boiling point:
where,
= boiling point of solution = ?
= boiling point of toluene =
= boiling point constant of toluene =
m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= mass of solute = 7.94 g
= mass of solvent (toluene) = 69.2 g
= molar mass of solute = 254g/mol
Now put all the given values in the above formula, we get:
Therefore, the boiling point (in °C) of a solution is 112.16