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bulgar [2K]
3 years ago
7

1 Cup of Boiling Water

Chemistry
2 answers:
ale4655 [162]3 years ago
7 0

Answer:

Side photo

A small still is separating propane and butane at 135 °C, and initially contains 10 kg moles of a mixture whose composition is x = 0.3 (x = mole fraction butane). Additional mixture (x = 0.3) is fed at the rate of 5 kg mole/hr. The total volume of the liquid in the still is constant, and the concentration of the vapor from the still (xp) is related to x, as follows: Xp = How long will it take for X, to change from 0.3 to 0.35.

DaniilM [7]3 years ago
3 0

Answer: A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.

Explanation: Heat and Temperature do not mean the same thing. ... A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.

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Select the correct answer.
ivann1987 [24]

Answer:

C.

Explanation:

The electronic configuration of N (7 electrons): 1s² 2s² 2p³.

The orbital 1s is filled with two electrons and their spinning direction is opposite and also electrons of 2s.

3p contains (3 electrons) should fill the 3 orbitals firstly. Every orbital contains 1 electron and be in the same spin direction.

So, the right choice is c.

A is wrong because 2 electrons of 3p are paired in the first orbital before filling every orbital.

B is wrong because the 2 electrons of 1s and 2s are in the same direction and also 2 electrons of 3p are paired in the first orbital before filling every orbital.

D is also wrong the 2 electrons of 1s and 2s are in the same direction and the electron in the second orbital of 3p are in opposite direction of the other 2 electrons.

7 0
4 years ago
How many molecules are there in 79g of Fe2O3? how many atoms is thi
Nookie1986 [14]
Molar mass of iron(III) oxide is 160g/mol

 160g ----------- of iron(III) oxide is ---------------- 6.02*10²³molecules
 79g   ----------- of iron(III) oxide is ---------------- x

x = [6.02*10²³*79g]/160g ≈ <u>2.97*10²³ molecules</u>
7 0
4 years ago
Write the equations that represent the first and second ionization steps for selenic acid (H2SeO4) in water. (Use H3O instead of
FrozenT [24]

Answer:

First ionization step:

H₂SeO₄(aq) + H₂O(l)  →  H₃O⁺(aq) + HSeO₄⁻(aq)

Second ionization step:

HSeO₄⁻(aq) + H₂O(l)  →  H₃O⁺(aq) + SeO₄⁻²(aq)

Explanation:

Selenic acid is a dyprotic and a strong acid with the formula: H₂SeO₄.

When it reacts to water, it release two protons in two ionizations.

Finally it gives hydronium to the medium.

H₂SeO₄(aq) + H₂O(l)  →  H₃O⁺(aq) + HSeO₄⁻(aq)

HSeO₄⁻(aq) + H₂O(l)  →  H₃O⁺(aq) + SeO₄⁻²(aq)

7 0
3 years ago
Methionine, ch3sch2ch2ch(nh2)co2h, is an amino acid found in proteins. draw a lewis structure of this compound. what is the hybr
Evgesh-ka [11]

hybridization is defined as mixing up of the atomic orbital with nearly same energies according to linear combination of atomic orbitals. the orbitals formed are equal in energy and are called hybrid orbitals .

6 0
3 years ago
Which of the following structures surround cells?
8090 [49]
Cells are surrounded by #2 , Cell membrane and Cell wall thats what protects the cell
4 0
3 years ago
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