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velikii [3]
3 years ago
8

Which of these metals will displace Iron from Iron Oxide ?

Chemistry
1 answer:
djverab [1.8K]3 years ago
7 0

Answer:

Magnesium

Explanation:

Magnesium is above iron in the reactivity series, which means that Mg can take oxygen from iron as it is a more reactive metal.

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I have five less protons than the least massive metalloid in<br> the fourth period. Who am I?
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You are the Cobalt

Explanation:

The least massive metalloid in the fourth period is Germanium, and it have 32 protons. If you have 5 less protons: 32 - 5 = 27 protons. The element with 27 protons is Cobalt

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What is the error in the electron configuration, 1s2 2s2 2p6 3s2 3p5 4s2?
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The combustion of hydrogen-oxygen mixtures is used to produce very high temperatures (ca. 2500 °C) needed for certain types of w
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Answer:

1360kJ are evolved

Explanation:

When 1mole of H2 reacts with 1/2 moles O2 producing 1 mole of water and 241.8kJ.

To solve this question we need to find the limiting reactant knowing were added 90g of H2 and 90g of O2 as follows:

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90g * (1mol / 32g) = 2.81moles

For a complete reaction of 2.81 moles of O2 are needed:

2.81 moles O2 * (1mol H2 / 1/2 mol O2) = 5.62 moles H2

As there are 45 moles, H2 is the excess reactant and O2 the limiting reactant.

As 1/2 moles O2 produce 241.8kJ, 2.81 moles will produce:

2.81 moles O2 * (241.8kJ / 1/2moles O2) =

<h3>1360kJ are evolved</h3>
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