Answer:
(a) The molality of this solution is 0.0613
(b)The molality of this solution is 2.04
Explanation:
The molality (m) of a solution is defined as the number of moles of solute present per kg of solvent.
The Molality of a solution is determined by the expression:
Molality is expressed in units
(a) You have 14.3 g of sucrose (C₁₂H₂₂O₁₁), the solute. With the molar mass of sucrose being 342 , then 14.3 grams of the compound represents the following number of moles:
0.042 moles
Having 685 g= 0.685 kg (being 1000 g= 1 kg) of water, the solvent, molality can be calculated as:
Solving:
molality= 0.0613
<u><em>The molality of this solution is 0.0613</em></u><u><em></em></u>
(b) In this case you have 7.15 moles of ethylene glycol (C₂H₆O₂), the solute, in 3505 g (equal to 3.505 kg) of water, the solvent, molality can be calculated as:
Solving:
molality= 2.04
<em><u>The molality of this solution is 2.04</u></em><em><u /></em>
Answer:
Explanation:
A covalent compound is a compound formed by covalent bonds. A covalent bond is formed between two atoms where electrons are shared between the two atoms. This forms a molecule.
What determines whether two elements will form a covalent compound or not is the number of valence electrons present in each of the elements.
Fluorine will form a covalent compound with phosphorous because fluorine has 5 electrons in its outermost shell. It needs 3 more to become stable.
Phosphorous also has 5 valence electrons. It needs 3 more to become stable.
What happens is that 3 atoms of FLuorine combine with one atom of Phosphorus, sharing the valence electrons between themselves. This leads to the formation of the PF3 molecule.
Both the Phosphorous and the Fluorine are now stable.
Answer:
True
Explanation:
The arrangement of three groups COOH, CO, OH in the order of reducing boiling point is as follow -
COOH > OH > CO
COOH gets strongly polarised due to the presence of electron withdrawing carboxy group and hence have strong H+ bonds as compared to that of alcohol.
Hence the given statement is true.
Answer:
0.2374 L
Explanation:
Formula for number of moles is;
Number of moles = mass/molar mass
molar mass of KNO3 = 101.1 g/mol
Thus;
n = 60/101.1
n = 0.5935
Formula for molarity is;
M = n/V
2.5 = 0.5935/V
V = 0.5935/2.5
V = 0.2374 L
Given:
T1 = 300 K
P1 = 500 kPa
P2 = 100 kPa
T2 = ?
Assume that the gas inside the container behaves ideally, we can use the ideal gas equation.
Additional assumption, volume remains constant.
PV = nRT
P/T = nR/V = constant
P1/T1 = P2/T2
500 kPa / 300 K = 100 kPa / T2
T2 = 60 K