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ddd [48]
3 years ago
13

SCRIE FORMULA ŞI DENUMEŞTE SUBSTANŢA

Chemistry
1 answer:
butalik [34]3 years ago
8 0

Answer:

raspunde in explicatie

Explanation:

În această întrebare, trebuie să scriem formula și să numim compusul.

A. 1 atom de azot și 3 atom de hidrogen Aceasta este NH3 și numele este amoniac

b. 2 atomi de hidrogen, 1 atom de carbon și 3 atomi de oxigen Adică H2CO3 Trioxocarbonat (iv)

C. 1 atom de carbon și 2 atomi de oxigen CO2 Oxid de carbon (iv)

d. 1 atom de calciu și 1 carbonat de grupă Aceasta este CaCO3 Adică trioxocarbonatul de calciu iv

e. Pb (II) și un carbonat Aceasta este PbCO3 Acesta este carbonatul de plumb (ii)

f. Grupa de cobalt 2 și fosfați

adică

Co3(PO4)2

Cobalt (ii) tetraoxofosfat (v)

g.Arsenic și radical sulfurat Adică As2S3 Trisulfida de arsen

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A sample of rest of the following composition 51.85 g of iron 22.22 g of oxygen 16.67 g of water
valentinak56 [21]

Answer:

To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C9H8O4. It is convenient to consider 1 mol of C9H8O4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements:

%

C

9

mol C

×

molar mass C

molar mass

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9

H

18

O

4

×

100

=

9

×

12.01

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180.159

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×

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=

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180.159

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3 0
2 years ago
During an experiment, 104 grams of calcium carbonate reacted with an excess amount of hydrochloric acid. If the percent yield of
postnew [5]

Answer:

92.4 grams.

Explanation:

  • From the balanced reaction:

<em>CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,</em>

1.0 mole of CaCO₃ reacts with 2.0 moles of HCl to produce 1.0 mole of CaCl₂, 1.0 mole of CO₂, and 1.0 mole of H₂O.

  • We need to calculate the no. of moles of (104 g) of CaCO₃:

<em>no. of moles of CaCO₃ = mass/molar mass</em> = (104 g)/(100.08 g/mol) = <em>1.039 mol.</em>

<u><em>Using cross multiplication:</em></u>

1.0 mole of CaCO₃ produce → 1.0 mole of CaCl₂.

∴ 1.039 mole of CaCO₃ produce → 1.039 mole of CaCl₂.

∴ The amount of CaCl₂ produced = no. of moles x molar mass = (1.039 mol)(110.98 g/mol) = 114.3 g.

∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.

Percent yield of the reaction = 80.15%, theoretical yield = 115.3 g.

<em>∴ actual yield = [(percent yield of the reaction)(theoretical yield)]/100 </em>= [(80.15%)/(115.3 g)] / 100 = <em>92.42 g ≅ 92.4 g.</em>

7 0
3 years ago
Helena uses the same force to move an object that has a mass of 12 kg and an object that has a mass of 5 kg. She predicts the 12
maria [59]

Answer:

No, the object with the smaller mass will have a greater change in motion.

Explanation:

Hope this helps!

8 0
3 years ago
If 45.0 mL of 6.00M HCl is added to 130 mL of H2O, Determine the molarity of the final solution. (show work)
Ivahew [28]

2.07 M is the molarity of the final solution if 45.0 ml of 6.00M HCl is added to 130 ml of H_{2}O.

Explanation:

Data given:

volume of HCl, V1 = 45 ml

molarity of the HCl solution, M1 = 6 M

final volume of the HCl solution after water is added, V2 = 130 ml

final molarity M2 =?

After the dilution, the molarity of the new solution can be found by using the formula:

M1V1 = M2V2

here M1 and V1 are the molarity and volume for concentrated solution, M2 and V2 represents the diluted solution's molarity and volume.

Applying the formula after rearranging the equation, we get

M2 = \frac{M1V1}{V2}

M2 = \frac{6X45}{130}

M2 = 2.07 M

The final molarity of the HCl solution is 2.07 M

4 0
4 years ago
When potassium reacts with arsenic to form an ionic compound, each metal atom loses ____ electron(s) and each nonmetal atom gain
klasskru [66]

Answer:

When potassium reacts with arsenic to form an ionic compound, each metal atom loses 1 electron(s) and each nonmetal atom gains 3 electron(s). There must be 3 potassium atom(s) for every 1 arsenic atom(s) in the reaction.

Explanation:

We need to consider the octet rule: each atom will gain or lose electrons to have 8 electrons in its valence shell.

  • Potassium is in Group 1, so it has 1 valence electron, which will lose to form K⁺.
  • Arsenic is in Group 15, so it has 5 valence electrons. Then, it will gain 3 electrons to form As³⁻.

To have an electrical molecule between K⁺ and As³⁻, we require 3 K⁺ and 1 As³⁻, and the resulting formula is K₃As.

7 0
3 years ago
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