Answer:
2.7 °C.kg/mol
Explanation:
Step 1: Calculate the freezing point depression (ΔT)
The normal freezing point of a certain liquid X is-7.30°C and the solution freezes at -9.9°C instead. The freezing point depression is:
ΔT = -7.30 °C - (-9.9 °C) = 2.6 °C
Step 2: Calculate the molality of the solution (b)
We will use the following expression.
b = mass of solute / molar mass of solute × kilograms of solvent
b = 102. g / (162.2 g/mol) × 0.650 kg = 0.967 mol/kg
Step 3: Calculate the molal freezing point depression constant Kf of X
Freezing point depression is a colligative property. It can be calculated using the following expression.
ΔT = Kf × b
Kf = ΔT / b
Kf = 2.6 °C / (0.967 mol/kg) = 2.7 °C.kg/mol
Answer:
0.5m/s²
Explanation:
Given parameters:
Mass to be pushed = 300kg
Force = 150N
Unknown:
Acceleration = ?
Solution:
To solve this problem, we need to apply newtons second law of motion which is expressed below:
F = m a
F is the force
m is the mass
a is the acceleration
150 = 300 x a
a = 0.5m/s²
<h3><u>Answer;</u></h3>
Carbon monoxide
<h3><u>Explanation;</u></h3>
- Clean Air Act is a US federal law that is designed to control the pollution of air on a national level.
- Under the clean air act, the environmental protection agency is required to regulate the emission of pollutants which endanger public health and welfare.
- <em><u>EPA is required to the emission of six major pollutants namely: carbon monoxide, nitrogen dioxide, sulfur dioxide, particulate matter, hydrocarbons and photochemical oxidants</u></em>.
In order to determine the state of the manganese ion, we will look at the anion bonded to it.
MnN, N = -3 so Mn(III)
MnO, O = -2 so Mn(II)
MnBr2, Br = -2 so Mn(II)
Mn2S3, S = -2 so Mn(III)
Mn3P2, P = -3 so Mn(II)
MnI3, I = -3 so Mn(II)
2.
For this question we will have to check the number of protons of each element from the periodic table. After this, we will remove or add electrons until the desired charge is attained (charge is difference between number of protons and electrons) since the number of protons does not change.
K+: protons = 19, electrons = 18
Cl-: protons = 17, electrons = 18
Fe+2: protons = 26, electrons = 24