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UNO [17]
3 years ago
14

Define empirical formula and molecular formula with example of each​

Chemistry
1 answer:
Arlecino [84]3 years ago
5 0
Hi -----):):$/$:); wyd n
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6. A 25.0-mL sample of potassium chloride solution was found to have a mass of 25.225 g.
Morgarella [4.7K]

Answer:

6. a. 5.53 (m/m) %; b. 0.7490M

7. 0.156M

Explanation:

6. In the solution of KCl, there are 1.396g of KCl in 25.225g of solution. As mass/mass percent is:

Mass solute / Mass solution * 100

The mass/mass percent of KCl is:

a. 1.396g KCl / 25.225g solution * 100

5.53 (m/m) %

b. Molarity is moles of solute per liters of solution:

<em>Moles KCl -Molar mass: 74.55g/mol-:</em>

1.396g KCl * (1mol / 74.55g) = 0.018726 moles KCl

<em>Volume in liters: 25mL = 0.025L</em>

Molarity:

0.018726 moles KCl / 0.025L = 0.7490M

7. 0.90% means 0.90g of NaCl in 100g of solution:

<em>Moles NaCl -Molar mass: 58.44g/mol-:</em>

0.90g NaCl * (1mol / 58.44g) = 0.0154 moles NaCl

<em>Volume in Liters:</em>

100g * (1mL / 1.01g) = 99mL = 0.099L

Molarity:

0.0154 moles NaCl / 0.099L =

0.156M

4 0
2 years ago
Formal charge of Cl in CHCl3
Vsevolod [243]
FC(C) = 4 - 0.5*8 - 0 = 0) FC(Cl) = 7 - 0.5*2 - 6 = 0
6 0
3 years ago
Much like a battery, wood contains stored energy. What energy transformations occur when wood is burned?
kotykmax [81]

Answer:

Chemical

Explanation:

8 0
2 years ago
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Calculate the mass of one atom of helium.​
mixer [17]

Answer:

One atom lf helium has a mass of 4 u

Know that 1 u =1.66. 10-24g

8 0
3 years ago
What is the compound name of S3I9?
klasskru [66]
Trisulfur nonaiodide

Step-by-step explanation:
The name for a binary molecular compound has the form
Multiplying prefix+name of first element multiplying prefix+stem of second element element+ide (two words)
The multiplying prefixes for three and nine are tri and nona, respectively.
The stem of iodine is iod.
Put them together, and the name of S₃I₉ is
trisulfur nonaiodide.
4 0
2 years ago
Read 2 more answers
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