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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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DENIUS [597]

Answer:

0.21 M. (2 sig. fig.)

Explanation:

The molarity of a solution is the number of moles of the solute in each liter of the solution. The unit for molarity is M. One M equals to one mole per liter.

How many moles of NaOH in the original solution?

n = c \cdot V,

where

  • n is the number of moles of the solute in the solution.
  • c is the concentration of the solution. c = 0.25 \;\text{M} = 0.25\;\text{mol}\cdot\textbf{L}^{-1} for the initial solution.
  • V is the volume of the solution. For the initial solution, V = 135\;\textbf{mL} = 0.135\;\textbf{L} for the initial solution.

n = c\cdot V = 0.25\;\text{mol}\cdot\textbf{L}^{-1} \times 0.135\;\textbf{L} = 0.03375\;\text{mol}.

What's the concentration of the diluted solution?

\displaystyle c = \frac{n}{V}.

  • n is the number of solute in the solution. Diluting the solution does not influence the value of n. n = 0.03375\;\text{mol} for the diluted solution.
  • Volume of the diluted solution: 25\;\text{mL} + 135\;\text{mL}  = 160\;\textbf{mL} = 0.160\;\textbf{L}.

Concentration of the diluted solution:

\displaystyle c = \frac{n}{V} = \frac{0.03375\;\text{mol}}{0.160\;\textbf{L}} = 0.021\;\text{mol}\cdot\textbf{L}^{-1} = 0.021\;\text{M}.

The least significant number in the question comes with 2 sig. fig. Keep more sig. fig. than that in calculations but round the final result to 2 sig. fig. Hence the result: 0.021 M.

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See the explanation below, please.

Explanation:

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Answer is: variables that were manipulated during the experiment.

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Laboratory room number is the least important.

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Explanation:

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