As per the International System of Units is a form of metric system in which distance is expressed in meters.
The given distance is 45.2 cm
Convert centimeter (cm) to SI base unit (meter)
One hundred centimeters is equivalent to one meter
I.e. 100 cm = 1 m
Therefore, the given distance of 45.2 cm =
= 45.2 cm * 1 m/100 cm = 0.452 m
Thus, the correct SI base unit for 45.2 cm = 0.452 m
Answer: D is right
Explanation: One mole contains 6.0225 ·10^23 molecules
Despite of the substance
The outer shell electrons are only involved in the bonding process since they are the only 'incomplete' shell and it needs to be fulfilled by another element.
Answer:
THE MOLAR MASS OF THE UNKNOWN MOLECULAR SUBSTANCE IS 200 G/MOL.
Explanation:
Mass of the unknown substance = 0.50 g
Freezing point of the solution = 3.9 °C
Freezing point of pure benzene = 5.5 °C
Freezing point dissociation constant Kf = 5.12°C/m
First, calculate the temperature difference between the freezing point of pure benzene and the final solution freezing point.
Change in temperature = 5.5 -3.9 = 1.6 °C
Next is to calculate the number of moles or molarity of the compound that dissolved.
Using the formula:
Δt = i Kf m
Assume i = 1
So,
1.6 °C = 1 * 5.12 * x/ 0.005 kg of benzene
x = 1.6 * 0.008 / 5.12
x = 0.0128 / 5.12
x = 0.0025 moles.
Next is to calculate the molar mass using the formula, molarity = mass / molar mass
Molar mass = mass / molarity
Molar mass = 0.50 g /0.0025
Molar mass = 200 g/mol
Hence, the molar mass of the unknown compound is 200 g/mol