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
Lesechka [4]
2 years ago
5

How many grams of potassium carbonate are needed to make 300ml of a 4.5M solution?

Chemistry
1 answer:
kenny6666 [7]2 years ago
4 0

Answer:

186.3g

Explanation:

4.5moles of K₂CO₃  is in 1000ml

? moles of K₂CO₃ is in 300 ml

(4.5 × 300)/ 1000 = 1.35 moles of K₂CO₃

1 mole of K₂CO₃ = (39 × 2) + 12 + (16 × 3) = 78 + 12 + 48 = 138g

1.35 moles of K₂CO₃  = ?

= (1.35 × 138)/1 = 186.3g

You might be interested in
A reaction that occurs in the internal combustion engine is n2(g) + o2(g) ⇌ 2 no(g) (a) calculate δh o and δs o for the reaction
jekas [21]
1) ΔrH = 2mol·ΔfH(NO) - (ΔfH(O₂) + ΔfH(N₂)).
ΔrH = 2 mol · 90.3 kJ/mol - (0 kJ/mol + 0 kJ/mol).
ΔrH = 180.6 kJ.
2) ΔS = 2mol·ΔS(NO) - (ΔS(O₂) + ΔS(N₂)).
ΔS = 2mol · 210.65 J/mol·K - (1mol · 205 J/mol·K + 1 mol · 191.5 J/K·mol).
ΔS = 24.8 J/K.
3) ΔG = ΔH - TΔS.
55°C: ΔG = 180.6 kJ - 328.15 K · 24.8 J/K = 172.46 kJ.
2570°C: ΔG = 180.6 kJ - 2843.15 K · 24.8 J/K = 110.09 kJ.
3610°C: ΔG = 180.6 kJ - 3883.15 K · 24.8 J/K = 84.29 kJ.
7 0
2 years ago
Which best describes the current atomic theory?
Dennis_Churaev [7]
Atoms are composed of electrons in a cloud around a positive nucleus.
8 0
3 years ago
Read 2 more answers
Be sure to answer all parts. One gallon of gasoline in an automobiles engine produces on average 9.50 kg of carbon dioxide, whic
KIM [24]

Answer:

The answer is below

Explanation:

one gallon of gasoline produces 9.50 kg of carbon.

The total number of cars = 40 million

Distance covered by each car = 7930 miles

Consumption rate of the cars per miles traveled is 23.6 miles per gallon.

Hence the annual gasoline consumption by all the cars in the United States of America = (total number of cars × Distance covered by each car) ÷ Consumption rate of the cars per miles

annual gasoline consumption by all the cars = (40000000 × 7930 miles) ÷ 23.6 miles/gallon = `1.344067797 × 10¹⁰ gallons

1.344067797 × 10¹⁰ gallons = 1.344067797*10^{10}\  gallons *\frac{9.50\ kg}{1\ gallon} =1.276864407*10^{11}\ kg\ of \ carbon\ dioxide

4 0
3 years ago
For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?
pochemuha

For which of the following conversions does the value of the conversion factor depend upon the formula of the substance?

The answer is C

3 0
3 years ago
Read 2 more answers
44 a 25.0-g sample of each of three unknown metals is added to 25.0 ml of water in graduated cylinders a, b, and c, and the fina
andreyandreev [35.5K]
Cylinder A - Adding 25 grams raised the water level by roughly 3.2 mL

Cylinder B - Adding 25 grams raised the water level by roughly 2.8 mL

Cylinder C - Adding 25 grams raised the water level by roughly 3.5 mL

Calculate grams/mL (density)

A. 25 g/3.2 mL = 7.8125 g/mL = Iron
B. 25 g/2.8 mL = 8.9286 g/mL = Nickel
C. 25 g/3.5 mL = 7.1429 g/mL = Zinc

Hope I helped!

5 0
3 years ago
Other questions:
  • A cylindrical specimen of some metal alloy having an elastic modulus of 126 GPa and an original cross-sectional diameter of 3.4
    6·1 answer
  • What is the IUPAC name for the compound shown below? ch3ch2ch2cnhch2ch3
    9·2 answers
  • The purpose of a coal burning power plant is to produce which end product?
    5·1 answer
  • PLEASE HELP ME&gt; 50 points<br> Compare and contrast 2-methylbutane with pentane
    7·1 answer
  • Which of the following compounds has only one atom of carbon?
    12·1 answer
  • Balance the following equation Sa+ F2---&gt; SF6
    14·1 answer
  • He free energy of a gas depends on __________. (select all correct answers) partial pressure of the gas van der waals constant f
    12·1 answer
  • What kind of reaction is photosynthesis?
    14·2 answers
  • Question 7
    5·1 answer
  • How many oxygen atoms are present in 3 grams of glucose
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!