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lyudmila [28]
3 years ago
11

Atom with three full orbits What is it

Chemistry
2 answers:
Karolina [17]3 years ago
4 0

Answer:

lithium

Explanation:

hope this helps.

nekit [7.7K]3 years ago
3 0

Answer:

Boron. The answer is boron.

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How many moles of oxygen are needed to react with 87 grams of aluminum
labwork [276]

Answer:

2.4 moles of oxygen are needed to react with 87 g of aluminium.

Explanation:

Chemical equation:

4Al(s)  + 3O₂(l)   → 2AlO₃(s)

Given data:

Mass of aluminium = 87 g

Moles of oxygen needed = ?

Solution:

Moles of aluminium:

Number of moles of aluminium= Mass/ molar mass

Number of moles of aluminium= 87 g/ 27 g/mol

Number of moles of aluminium= 3.2 mol

Now we will compare the moles of aluminium with oxygen.

                              Al         :         O₂

                               4          :         3

                               3.2       :         3/4×3.2 = 2.4 mol

2.4 moles of oxygen are needed to react with 87 g of aluminium.

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A truck travels 110 miles and it speed is 55mi/hr. How long did it take to
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