1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
allochka39001 [22]
2 years ago
5

What is the molality of 30g of NACI dissolved in 350g of water

Chemistry
2 answers:
ivolga24 [154]2 years ago
8 0

Answer:

1.47 m

Explanation:

The molality can be found using the following equation:

Molality = moles solute / mass (kg) solvent

In this case, NaCl is the solute and H₂O is the solvent. To find the molality, you need to (1) convert grams NaCl to moles (via the molar mass), then (2) convert grams H₂O to kilograms, and then (3) calculate the molality.

(Step 1)

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

 30 grams NaCl                 1 mole
--------------------------  x  ------------------------  =  0.513 moles NaCl
                                      58.443 grams

(Step 2)

1,000 grams = 1 kg

350 grams H₂O                   1 kg
--------------------------  x  -----------------------  =  0.35 kg H₂O
                                      1,000 grams

(Step 3)

Molality = moles solute / mass (kg) solvent

Molality = 0.513 moles NaCl / 0.35 kg H₂O

Molality = 1.47 m

Anastasy [175]2 years ago
5 0

Answer:

1.45 mol/kg

Explanation:

nilered videos

You might be interested in
How many moles of pcl5 can be produced from 28.0 g of p4 (and excess cl2)?
BARSIC [14]
P₄ + 10Cl₂ ---> 4PCl₅
stoichiometry of P₄ to PCl₅ is 1:4
number of moles of P₄ reacted - 28.0 g / 124 g/mol = 0.22 mol 
Cl₂ is in excess therefore P₄ is the limiting reactant, amount of product formed depends on amount of limiting reactant present 
according to molar ratio of 1:4
number of PCl₅ moles formed  -0.22 mol x 4 = 0.88 mol 
0.88 mol of PCl₅ is formed 

5 0
3 years ago
A sample of vinegar was found to have an acetic acid concentration of 0.8846 m. What is the acetic acid % by mass? Assume the de
jenyasd209 [6]

Answer:

5.3%

Explanation:

Let the volume be 1 L

volume , V = 1 L

use:

number of mol,

n = Molarity * Volume

= 0.8846*1

= 0.8846 mol

Molar mass of CH3COOH,

MM = 2*MM(C) + 4*MM(H) + 2*MM(O)

= 2*12.01 + 4*1.008 + 2*16.0

= 60.052 g/mol

use:

mass of CH3COOH,

m = number of mol * molar mass

= 0.8846 mol * 60.05 g/mol

= 53.12 g

volume of solution = 1 L = 1000 mL

density of solution = 1.00 g/mL

Use:

mass of solution = density * volume

= 1.00 g/mL * 1000 mL

= 1000 g

Now use:

mass % of acetic acid = mass of acetic acid * 100 / mass of solution

= 53.12 * 100 / 1000

= 5.312 %

≅ 5.3%

3 0
3 years ago
In the reaction 2H2O (1)+ 2Cl^- (aq)= H2(g)+Cl2 (g)+ 2OH^-(aq), which substance is reduced?
Oksanka [162]

Answer:- C. H

Explanations:- Reduction is gain of electron. In other words we could say that decrease in oxidation number is reduction.

As per the rules, oxidation number of hydrogen in its compounds is +1(except metal hydrides) and the oxidation number of oxygen in its compounds is -2.

The oxidation number in elemental form is zero.

In H_2O , the oxidation number of H is +1 and oxidation number of O is -2. Oxidation number of Cl in Cl^- is -1. On product side, the oxidation number of hydrogen in H_2 is zero and in OH^- the oxidation number of H is +1 and that of O is -2. Oxidation number of Cl in Cl_2 is 0.

From above data, Oxidation number of O is -2 on both sides so it is not reduced.

Oxidation number of Cl is changing from -1 to 0 which is oxidation.

Oxidation number of H is changing from +1 to 0 which is reduction.

So, the right choice is C.H

8 0
3 years ago
2. Combine lead (II) nitrate and potassium iodide solutions.<br> Pb(NO3)2+ Kl →
Shtirlitz [24]

Answer:

Pb(NO3)2 + KI = KNO3 + PbI2

7 0
3 years ago
How is wavelength measured (Select all that apply. from the trough (bottom) of one wave to the trough of the next wave
mr Goodwill [35]

Answer:

The first two

5 0
2 years ago
Read 2 more answers
Other questions:
  • A 6.00 liter sample of air has a pressure of 207 kilopascals at a temperature of 50°C. Which law will you use to calculate the n
    10·1 answer
  • Wybierz spośród podanych określeń wlaściwości tlenku węgla4 i wpisz je w odpowiednie kolumny tabeli
    5·1 answer
  • Give an example of an artificial satellite. will give brainliest
    5·2 answers
  • What is the parts of the Transverse wave and longitudinal wave
    8·1 answer
  • A 7.337 gram sample of chromium is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 9.595 g. Dete
    11·1 answer
  • When minerals break along straight lines or flat planes we call that __________.
    15·2 answers
  • Choose the products that complete the reaction. The chemical equations may not be balanced. HCl + NaOH ? NaCl + H2O NaCl + CO2 +
    8·1 answer
  • HURRY!! 30 points!!
    13·1 answer
  • Please Help Im Struggling And Failing I Need All The Help I Can Get!!!!
    10·2 answers
  • Calculate the [H3O+] for orange juice, which has a [OH–] = 5.0 × 10–11 M.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!