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frez [133]
3 years ago
12

What is the formula of a compound formed between iodine (I) and calcium (Ca)?

Chemistry
2 answers:
bixtya [17]3 years ago
8 0

<u>Answer:</u> The chemical formula for the compound will be CaI_2

<u>Explanation:</u>

Calcium is the 20th element of the periodic table having electronic configuration of [Ar]4s^2

This element will loose 2 electrons and thus shows an oxidation state of +2 units.

Iodine is the 53rd element of the periodic table having electronic configuration of [Kr]5s^24d^{10}5p^5

This element requires 1 electron and thus shows an oxidation state of -1 units.

So, by criss-cross method, the oxidation state of the ions will get exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

Hence, the chemical formula for the compound formed will be CaI_2

Nadya [2.5K]3 years ago
7 0
Calcium iodide (chemical formula <span>CaI2</span>)
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23) What is the volume of 2.454 x 1024 atoms of nitrogen gas at STP?
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Answer:

d) V =  91.3 L

Explanation:

Given data:

Volume of nitrogen = ?

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Number of atoms of nitrogen = 2.454×10²⁴ atoms

Solution:

First of all we will calculate the number of moles of nitrogen by using Avogadro number.

1 mole = 6.022×10²³ atoms

2.454×10²⁴ atoms × 1 mol / 6.022×10²³ atoms

0.407×10¹ mol

4.07 mol

Volume of nitrogen:

PV = nRT

1 atm × V = 4.07 mol ×0.0821 atm.L /mol.K ×273.15 K

V =  91.3 atm.L /1 atm

V =  91.3 L

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