2.48 grams.
<h3>Explanation</h3>
Start by finding the formula mass for cobalt (II) chloride and cobalt (II) chloride hexahydrate.
As a transition element in the middle d-block of the periodic table, cobalt can form ions with a plurality of charges. It is thus necessary to indicate its charge in systematic names of cobalt-containing formula.
The cation "cobalt" in the systematic name of the salt has the Roman numeral "(II)" attached to it in brackets. As a metal, cobalt forms positively-charged ion. The one here thu has charge of +2.
Chloride ions have charges -1. Charges cancel out to produce neutral compounds. Each cobalt cation in this salt would thus pair with two chloride anions. Hence the empirical formula:
.
The prefix "<em>hexa-</em>" in the name cobalt (II) chloride <em>hexa</em>hydrate indicates that every formula unit of this salt contains six units of water. The hydrated salt thus has an empirical formula of
.
Given the relative atomic mass for each of the elements, as seen on a modern periodic table of the elements:
- Cobalt- 58.93
![\text{g}\cdot \text{mol}^{-1}](https://tex.z-dn.net/?f=%5Ctext%7Bg%7D%5Ccdot%20%5Ctext%7Bmol%7D%5E%7B-1%7D)
- Chloride- 35.45
- Hydrogen- 1.008
![\text{g}\cdot \text{mol}^{-1}](https://tex.z-dn.net/?f=%5Ctext%7Bg%7D%5Ccdot%20%5Ctext%7Bmol%7D%5E%7B-1%7D)
- Oxygen- 16.00
![\text{g}\cdot \text{mol}^{-1}](https://tex.z-dn.net/?f=%5Ctext%7Bg%7D%5Ccdot%20%5Ctext%7Bmol%7D%5E%7B-1%7D)
Thus the formula mass of each compound
- Cobalt (II) chloride
- 129.83 ![\text{g}\cdot \text{mol}^{-1}](https://tex.z-dn.net/?f=%5Ctext%7Bg%7D%5Ccdot%20%5Ctext%7Bmol%7D%5E%7B-1%7D)
- Cobalt (II) chloride hexahydrate
- 262.12 ![\text{g}\cdot \text{mol}^{-1}](https://tex.z-dn.net/?f=%5Ctext%7Bg%7D%5Ccdot%20%5Ctext%7Bmol%7D%5E%7B-1%7D)
Cobalt (II) chloride hexahydrate
decomposes under heat to produce cobalt (II) hexahydrate and water. Hence the equation:
![\text{Co}\text{Cl}_2\cdot (\text{H}_2\text{O})_6 \stackrel{\Delta}{\to}\text{Co}\text{Cl}_2 +6 \; \text{H}_2\text{O}](https://tex.z-dn.net/?f=%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%5Ccdot%20%28%5Ctext%7BH%7D_2%5Ctext%7BO%7D%29_6%20%5Cstackrel%7B%5CDelta%7D%7B%5Cto%7D%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%20%2B6%20%5C%3B%20%5Ctext%7BH%7D_2%5Ctext%7BO%7D)
Therefore
- Molar ratio:
![n(\text{Co}\text{Cl}_2) : n(\text{Co}\text{Cl}_2 \cdot (\text{H}_2\text{O})_6 = 1 : 1](https://tex.z-dn.net/?f=n%28%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%29%20%3A%20n%28%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%20%5Ccdot%20%28%5Ctext%7BH%7D_2%5Ctext%7BO%7D%29_6%20%3D%201%20%3A%201)
- Mass ratio:
![m(\text{Co}\text{Cl}_2) : m(\text{Co}\text{Cl}_2 \cdot (\text{H}_2\text{O})_6) = 262.12 : 129.83](https://tex.z-dn.net/?f=m%28%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%29%20%3A%20m%28%5Ctext%7BCo%7D%5Ctext%7BCl%7D_2%20%5Ccdot%20%28%5Ctext%7BH%7D_2%5Ctext%7BO%7D%29_6%29%20%3D%20262.12%20%3A%20129.83)
The mass ratio
indicates that 262.12 grams of cobalt (II) chloride hexahydrate decomposes to produce 129.83 grams of its corresponding anhydrous salt. Accordingly, heating 5.00 grams of the hexahydrate would produce 2.48 grams of its anhydrate.
Answer:
Mg + AgNO₃ → Ag + Mg(NO₃)₂
Explanation:
A single replacement reaction is one in which an element gets replaced by another in a compound.
In the reaction
Mg + AgC→ Ag + Mg(NO₃)₂
Ag in AgNO₃ is replaced by Mg to give Mg(NO₃)₂.Only one element is getting replaced and hence it is a single replacement reaction.
I was unable to come up with an answer but I still wanted to help so heres a site that'll give you your answer. http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/index.php
Answer:
Volume is directly proportional to absolute temperature.
Explanation:
DNA and RNA are amplified in vitro using polymerase chain reaction (PCR), which is frequently employed in biochemical analysis.
The PCR process is very temperature sensitive, and thermal management is crucial to PCR operation in order to maintain the necessary set points for temperature at each stage of the procedure. The objective of this investigation is to develop a thermal approach that can quickly boost the heating/cooling thermal cycle speed while keeping the substrate that contains the aqueous nucleic acid sample at a constant temperature. This study examines a novel microfluidic PCR heat cycler that makes use of a suitably configured design that is filled with a porous material.
Learn more about Polymerase chain reaction here-
brainly.com/question/11417541
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