Epsom salts are hydrate of magnesium sulfate. The formula is MgSO_{4}.7H_{2}O. It has 7 water molecules.
Here, hydrate means it is bind to water molecules. Dehydration means removal of water molecules. Thus, Epsom salt in its complete dehydration loss all its water molecules and the remaining formula of dehydrated Epsom salt will be MgSO_{4} also known as magnesium sulfate.
"Iron and sulfur are both elements from the periodic table of elements. As such, each one has its own unique set of physical and chemical properties. Iron is a metal, while sulfur is a nonmetal. When these two are heated together, the iron atoms combine with the sulfur atoms to make a compound known as iron sulphide. A compound is different from elements in that it is made from the chemical union of two or more elements. Iron sulphide is not iron or sulfur; it is a pure substance with its own set of distinguishing physical and chemical characteristics. A mixture, on the other hand, is what you get by combining two or more elements, but not chemically combining them. In the case of the iron and the sulfur, if you mix them and provide no heat, you simply have a mixture of iron and sulfur. Mixtures are different from compounds in that they are easily separated. A magnet could be used to separate the iron from the sulfur, because iron is attracted to magnets, while sulfur is not." https://www.enotes.com/homework-help/explain-why-iron-sulphide-compound-not-just-336735 - I hope this helps! :)
Explanation:
1 mole of a gas has 22.4 L of volume at STP. Therefore, 0.5 mol of H2 has 0.5 x 6.022 x 1023 = 3.011 x 1023 molecules. Hence, the number of moles, molecules and atoms present in 11.2 liters of H2 at STP are 0.5 , 3.011 x 1023 and 6.022 x 1023 respectively.
<u>Answer:</u>
<em>5 molecules of oxygen will be present
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<u>Explanation:</u>
<em>In this reaction combustion is taking place hence there must be presence of oxygen in it.
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We don't know the initial amount of carbon molecules in hydrogen molecules present hence the equation goes:-
Mass of fuel 16.74 grams, Mass of carbon dioxide is 1198 gram and water is 0.0654 remaining mass of fuel is 16.70 g. Hence amount of fuel used up is 0.04 gram
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<em>Weight of products is 0.1852 and weight of oxygen is 0.1452
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<em>No of molecules will be molecules
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