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3 years ago

Which element has a complete valence electron shell?

2 answers:

8 0

The element that has a complete valence electron shell is argon (Ar) since it is a noble gas in the last group on the periodic table.

sertanlavr [38]3 years ago

8 0

The answer is argon (Ar)

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Oxidation number for O in: AIPO4

katen-ka-za [31]

Answer:

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Explanation:

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3 years ago

In the chemical equation H2O2(aq) → H2O(l) + O2(<br> g., the O2(<br> g. is a ____.

padilas [110]

.......the answer is a gas

5 0

3 years ago

If calcium were to react with carbon, what would likely form?

Lady_Fox [76]

Answer: calcium oxide will react with carbon dioxide to form calcium carbonate. I don't know if that's what you were asking.

Explanation:

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3 years ago

Convert 1.8 cm3 to the unit m3. please. quickly.

oksano4ka [1.4K]

1.8e-6 this should be the correct answer according to my mass converter.

8 0

3 years ago

3H2 + N2 —> 2NH3 .

In-s [12.5K]

Answer:

$\boxed{1.26 \times 10^{20} \text{ molecules NH}_{3}}$

Explanation:

We will need a balanced chemical equation with masses, moles, and molar masses.

1. Gather all the information in one place:

M_r: 2.016 17.03

3H₂ + N₂ ⟶ 2NH₃

m/g: 6.33 × 10⁻⁴

2. Calculate the moles of H₂

$\text{Moles of H}_{2} = 6.33 \times 10^{-4}\text{ g H}_{2} \times \dfrac{\text{1 mol H}_{2}}{\text{2.016 g H}_{2}} = 3.140 \times 10^{-4} \text{ mol H}_{2}$

3. Calculate the moles of NH₃

The molar ratio is 2 mol NH₃/3 mol H₂.

$\text{Moles of NH}_{3} = 3.140 \times 10^{-4} \text{ mol H}_{2} \times \dfrac{\text{2 mol NH}_{3}}{\text{3 mol H}_{2}} = 2.093 \times 10^{-4}\text{ mol NH}_{3}$

4. Calculate the molecules of NH₃

There are 6.022 × 10²³ molecules of NH₃/1 mol NH₃.

$\text{Molecules of NH}_{3} = 2.093 \times 10^{-4}\text{ mol NH}_{3} \times \dfrac{6.022 \times 10^{23}\text{ molecules NH}_{3}}{\text{1 mol NH}_{3}}\\= 1.26 \times 10^{20}\text{ molecules NH}_{3}\\\text{The reaction produces } \boxed{\mathbf{1.26 \times 10^{20}} \textbf{ molecules NH}_{3}}$

3 0

3 years ago