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n200080 [17]
3 years ago
13

Calculate the number of moles present in 9.50g of co2

Chemistry
1 answer:
pshichka [43]3 years ago
3 0

Answer:

0.4318 mol

Explanation:

Moles= mass/ mollar mass

Moles= 9.50/22

Moles= 0.4318 mol

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State Hund's rule.
loris [4]

Answer:

C. The lowest-energy electron configuration of an atom has the maximum number of unpaired electrons, all of which have the same spin, in degenerate orbitals.

Explanation:

The Hund's rule is used to place the electrons in the orbitals is it states that:

1. Every orbital in a sublevel is singly occupied before any orbital is doubly occupied;

2. All of the electrons in singly occupied orbitals have the same spin.

So, the electrons first seek to fill the orbitals with the same energy (degenerate orbitals) before paring with electrons in a half-filled orbital. Orbitals doubly occupied have greater energy, so the lowest-energy electron configuration of an atom has the maximum number of unpaired electrons, and for the second statement, they have the same spin.

The other alternatives are correct, but they're not observed by the Hund's rule.

6 0
3 years ago
Сульфат железа (II) окисляется в кислой среде перманганатом калия до Fe2(SO4)3, т.е. окисляется. Запишите и приравняйте уравнени
SOVA2 [1]

Answer:

Sorry for disrespecting you but i don't know your language. I want to help but my problem is your language IM SO SORRY

5 0
3 years ago
1-propanol (P1° = 20.9 Torr at 25 °C) and 2-propanol (P2° = 45.2 Torr at 25 °C) form ideal solutions in all proportions. Let x1
jekas [21]

Answer:

y1 = 0.3162

y2 = 0.6838

Explanation:

ok let us begin,

first we would be defining the parameters;

at 25°C;

1-propanol P1° = 20.90 Torr

2-propanol P2° = 45.2 Torr

From Raoults law:

P(1-propanol) = P⁰ × X(1-propanol)

P(1-propanol) = 20.9 torr × 0.45 = 9.405

P(1-propanol) = 9.405 torr

Also P(2-propanol) = P⁰ × X(2-propanol)

P(2-propanol) = 45.2 torr × 0.45

P(2-propanol) = 20.34 torr

but the total pressure = sum of individual pressures

total pressure = 9.405 + 20.34

total pressure = 29.745 torr

given that y1 and y2 represent the mole fraction of each in the vapor phase

y1 = P1 / total pressure

y1 = 9.405/29.745

y1 = 0.3162

Since y1 + y2 = 1

y2 = 1 - y1

∴ y2 = 1 -  0.3162

y2 = 0.6838

cheers, i hope this helps.

7 0
3 years ago
Which of the following chemical formulas shows a covalent bond (a) CO2 (b) MgO (c) NaCL (d) HBr
AlexFokin [52]
The correct answer is A. CO2
hope this helps
3 0
3 years ago
Which description identifies the correct charge of each atomic particle?
SVETLANKA909090 [29]
The main atomic partilces are electrons, protons and neutrons.

Electrons are around the nuclei and have negative charge.

Protons and neutrons are in the nulei of the atoms. Protons are positive and their charge balance the charge of the electrons, so the atom is neutral.

Neutrons have no charge.

So, the answer is:

the charge of electrons is negative, the charge of the protons is positive and the neutrons have no charge.
3 0
3 years ago
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