Answer:
0.960 m
Explanation:
Given data
- Mass of the solute: 27.9 g
- Molar mass of the solute: 233.2 g/mol
- Mass of the solvent: 125.0 g = 0.1250 kg
First, we will calculate the moles of solute.
27.9 g × (1 mol/233.2 g) = 0.120 mol
The molality of the compound is:
m = moles of solute / kilograms of solvent
m = 0.120 mol / 0.1250 kg
m = 0.960 m
Answer:
323.15 °C
Explanation:
Considering the ideal gas equation as:
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 0.0821 L.atm/K.mol
Thus, at constant volume and number of moles, Pressure of the gas is directly proportional to the temperature of the gas.
P ∝ T
Also,
Using Charle's law
Given ,
P₂ = 2P₁
T₁ = 25 °C
T₂ = ?
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T₁ = (25 + 273.15) K = 298.15 K
Using above equation as:
New temperature = 596.3 K
Also,
T(K) - 273.15 = T( °C)
<u>So, Temperature = 596.3 - 273.15 °C = 323.15 °C</u>
It's 0,8563 or %85,63 ( same thing )
Hope I helped! ( Smiles )
You can use the periodic table.
H2O = Water
Two hydrogen
One oxygen
I don’t know if your numbers are rounded but if you look at your periodic table, you will see a number close to 1.008 for hydrogen and a number close to 15.999 for oxygen. You can multiple the number for hydrogen twice and add 15.999. You should get a number close to 18.015 g/mol.
Answer:
"Very simple" - so make sure you learn this - this is the basis for chemistry!
ok - you know that there is a certain amout of a chemical (CO2) in a given volume. That amount is in moles.You need grams. This is a unit conversion problem; you need to convert the units from moles (0.30 moles CO2) to grams (__ grams CO2).
You need to know the molecular weight of CO2, which has 1 carbon atom and 2 oxygen atoms. A carbon atom's atomic weight is (off the periodic table):
C = 12.011 grams per mole (aka g/mol)
An oxygen atom's atomic weight: O = 15.999 grams per mole (g/mol)
Now, add the atomic weights together to get the molecular weight (remember 1 carbon and 2 oxygens):
1*(12.011 g/mol) + 2*(15.999 g/mol) = 44.009 g/mol (this is the conversion factor you need for your final calculation)
Now, convert from moles CO2 to grams CO2 by multiplying (ensure the units cancel correctly):
(0.30 mole CO2)*(44.009 g CO2/mol CO2) = 13.2027 g CO2 = 13 g CO2 (2 sig. figs.)
Explanation:
