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Andrej [43]
3 years ago
9

HELP HELP HELP!!!!!!!!!!

Chemistry
1 answer:
Elenna [48]3 years ago
8 0

the answer will there for be ironic

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Empirical formula of 25.13g sulfur and 49.87g copper
antiseptic1488 [7]

Copper + sulfur create copper sulfide.

It's a lengthy process to find the empirical formula:

Sulfur:

25.13g * \frac{1 mol}{32.065 g} = 0.78 mol

Copper:

49.87 * \frac{1 mol}{63.546 g} = 0.78mol

S:Cu => \frac{0.78}{0.78} :\frac{0.78}{0.78} => (1:1) * 1 => 1:1

The empirical formula would just be CuS

7 0
3 years ago
All of the elemnts in groups of 17 of the modern periodic table are classfied as
viktelen [127]

Answer:

Halogens

Explanation:

All the elements in Group 17 on the periodic table are classified as halogens. The members of this group are:

  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
  • Astatine

They are also known as the group VIIA

Their general outer energy level structure is ns² np⁵

  • The first four members of the group are common. Fluorine is the most reactive non-metal and iodine is less reactive.
  • Due to lack of one electron to complete their outermost shell, they are good oxidizing agents and are univalent.

3 0
4 years ago
The energy E of the electron in a hydrogen atom can be calculated from the Bohr formula:
uysha [10]

Answer:

The wavelength of the line in the absorption line spectrum of hydrogen caused by transition is 657.1 nm.

Explanation:

Energy of the electron in a hydrogen atom in nth shell:

E=\frac{-R_y}{n^2}

R_y=2.178\times 10^{-18} J

Energy of an electron in n = 2:

E_2=\frac{-R_y}{2^2}=-\frac{R_y}{4}

Energy of an electron in n = 3:

E_3=\frac{-R_y}{3^2}=-\frac{R_y}{9}

Energy difference in between both the shells:

\Delta E=E_3-E_2 :

=-\frac{R_y}{9}-(-\frac{R_y}{4})=\frac{5R_y}{36}

\Delta E=\frac{5R_y}{36} =\frac{5\times 2.178\times 10^{-18} J}{36}

=3.025\times 10^{-19} J

\Delta E=3.025\times 10^{-19} J=\frac{hc}{\lambda}

\lambda =\frac{hc\times 36}{3.025\times 10^{-19} J}

=\frac{6.626\times 10^{-34} J s\times 3\times 10^8 m/s}{3.025\times 10^{-19} J}

\lambda =6.571\times 10^{-7} m=657.1 nm

1 m = 10^9 nm

The wavelength of the line in the absorption line spectrum of hydrogen caused by transition is 657.1 nm.

8 0
4 years ago
3. What is the current in a wire
Mrrafil [7]
4.8A
12/2.5=4.8, the current in this wire should be 4.8A
5 0
3 years ago
Ice melts to form water. And water freezes to form ice. Choose the TRUE statement about these changes.
Dmitrij [34]

Answer:

A. Both freezing and melting are physical changes.

Explanation:

Even if you were to freeze water, the molecules are still water molecules, and vise versa with melting it.

4 0
3 years ago
Read 2 more answers
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