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gladu [14]
3 years ago
10

A solution is made by dissolving 2.5 moles of sodium chloride (NaCl) in 198 grams of water. If the molal boiling point constant

for water (Kb) is 0.51 °C/m, what would be the boiling point of this solution? Show all of the work needed to solve this problem.
Chemistry
1 answer:
GREYUIT [131]3 years ago
8 0
Calculate the mol of NaCl dissolved in 1.0kg water :


198 g / 1000 => 0.198 Kg

molality = moles solute / volume 

molality = 2.5 / 0.198

molality = 12.626 mol/kg

NaCl dissociates to form 2 ions 

increase in boiling point = molality * i * Kb

12.626 * 2 * 0.51  => 12.87 ºC

<span>Water boils at 100.00 degrees Celsius , therefore:
</span>
12.87 + 100.00 => 112.87ºC

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When the reaction CO2(g) + H2(g) ⇄ H2O(g) + CO(g) is at equilibrium at 1800◦C, the equilibrium concentrations are found to be [C
UNO [17]

Answer:

The new molar concentration of CO at equilibrium will be  :[CO]=1.16 M.

Explanation:

Equilibrium concentration of all reactant and product:

[CO_2] = 0.24 M, [H_2] = 0.24 M, [H_2O] = 0.48 M, [CO] = 0.48 M

Equilibrium constant of the reaction :

K=\frac{[H_2O][CO]}{[CO_2][H_2]}=\frac{0.48 M\times 0.48 M}{0.24 M\times 0.24 M}

K = 4

CO_2(g) + H_2(g) \rightleftharpoons H_2O(g) + CO(g)

Concentration at eq'm:

0.24 M          0.24 M                 0.48 M            0.48 M

After addition of 0.34 moles per liter of CO_2 and H_2 are added.

(0.24+0.34) M    (0.24+0.34) M  (0.48+x)M         (0.48+x)M

Equilibrium constant of the reaction after addition of more carbon dioxide and water:

K=4=\frac{(0.48+x)M\times (0.48+x)M}{(0.24+0.34)\times (0.24+0.34) M}

4=\frac{(0.48+x)^2}{(0.24+0.34)^2}

Solving for x: x = 0.68

The new molar concentration of CO at equilibrium will be:

[CO]= (0.48+x)M = (0.48+0.68 )M = 1.16 M

3 0
3 years ago
A student combined two colorless aqueous solutions. One of the solutions contained Na2CO3 as the solute and the other contained
Kazeer [188]

Answer:

Bubbles will be formed when two solutions will be combined.

Explanation:

When the solution containing Na_{2}CO_{3} and HCl as a solute will be combined, the reaction will be as follows,

Na_{2}CO_{3}(aq) + 2HCl(aq) \rightarrow   2NaCl(aq)+ H_{2}O(l)+CO_{2}(g)

As a result of combination of the two solutions bubbles will be formed which will depict the evolution of carbon dioxide gas.

5 0
3 years ago
Calculate the molecular masses of C4 H10 atoms molecules or ionic formulae​
Basile [38]
C4H10 is an alkane (propane to be precise)

The relative formula mass of a molecule of propane is

(12x4) + (1x10) = 58

because a carbon atom has an atomic weight of 12 and a hydrogen atom has an atomic weight of 1.
8 0
2 years ago
Consider a saturated solution formed when 17.5 g of a solute dissolve in 28.3 g of a solvent, giving a total solution volume of
STALIN [3.7K]

Answer:

a) 38.2 % mass

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Explanation:

Given the data:

mass of solute = 17.5 g

mass of solvent= 28.3 g

total solution volume= 27.8 mL

a)- mass percent= mass of solute/mass of solution x 100

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b)- solubility = grams of solute/ 100 g solvent

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c)- density = massof solution/total volumesolution  = 45.8 g/27.8 mL = 1.65 g/mL

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