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hodyreva [135]
3 years ago
9

Which element from the periodic table has four valence electrons

Chemistry
2 answers:
Ivahew [28]3 years ago
6 0

carbon has 4 valence electrons

enyata [817]3 years ago
4 0

Any element in group 14

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B. 4.75 × 10-4 is the answer
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Atoms of two adjacent elements in the third period are in the ground state. An atom of element A has only s electrons in its val
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Answer:

Explanation:

A is Magnesium, B is Aluminium both are adjacent element and lie in third period.

Magnesium with atomic number of 12 consist two s electrons in it's valence shell in ground state whereas, Aluminium which has atomic number of 13 consist three electrons in it's valence shell in the ground state out of which two are s electrons and only one p electron.

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3 years ago
B) How many kilograms of carbon dioxide are formed when 24.42 g of iron is<br> produced?
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Answer:

0.0289 kg of CO2 will be formed

Explanation:

Step 1: Data given

Mass of iron produced = 24.42 grams

Atomic mass iron = 55.845 g/mol

Molar mass CO2 = 44.01 g/mol

Step 2: The balanced equation

Fe2O3 + 3CO → 2Fe + 3CO2

Step 3: Calculate moles iron

Moles iron = mass iron / molar mass iron

Moles iron = 24.42 grams / 55.845 g/mol

Moles iron = 0.437 moles

Step 4: Calculate moles CO2

For 1 mol Fe2O3 we need 3 moles CO to produce 2 moles Fe and 3 moles CO2

For 0.437 moles Fe we'll have 3/2 * 0.437 = 0.6555 moles CO2

Step 5: Calculate mass CO2

Mass CO2 = moles CO2 * molar mass CO2

Mass CO2 = 0.6555 moles * 44.01 g/mol

Mass CO2 = 28.85 grams = 0.0289 kg

0.0289 kg of CO2 will be formed

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Coefficient for sulfuric acid: 1
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Answer:

0.08024

Explanation:

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3 years ago
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