2 years ago

The number of electrons in neutral atoms of the elements

1 answer:

4 0

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

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Convert the following to moles 5.70 grams of ZrF4

marysya [2.9K]

5.70 g ZrF4* (1 mol ZrF4/ 167.2 g ZrF4)= 0.0341 mol ZrF4.

The final answer is 0.0341 mol ZrF4~

5 0

2 years ago

You have 10.0 g each of Na, C, Pb, Cu and Ne. Which contains the smallest number of moles? You have 10.0 g each of Na, C, Pb, Cu

sergejj [24]

Answer:

The answer to your question is number 1. Pb

Explanation:

Data

10 grams of Na, C, Pb, and Ne

Process

Calculate the moles of each element

23 g of Na ----------------- 1 mol

10 g of Na ------------------- x

x = 0.43 moles of Na

20 g of Ne ---------------- 1 mol

10 g of Ne ----------------- x

x = 0.5 moles of Ne

64 g of Cu -------------- 1 mol

10 g of Cu -------------- x

x = 0.16 moles of Cu

207 g of Pb ------------- 1 mol

10 g of Pb -------------- x

x = 0.048 moles of Pb

Pb has the smallest number of moles

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2 years ago

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zhenek [66]

Answer:

Air pollution

Explanation:

Carbon(IV)oxide is sometimes harmful to man but good for plant in other to manufacture their food

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2 years ago

How many electrons are in the valence shell?

LenKa [72]

I got 5-8 but i’m not 100% sure

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2 years ago

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7. What is the potential energy of a rock that has a mass of 100 kg that is sitting on top of a hill 300 m high?

levacccp [35]

Answer:

294000 J or 294 kJ

Explanation:

Potential energy is given by:

$U=mgh$

Where U is potential energy, m is mass, g is acceleration due to gravity, and h is height. Using this equation:

$U=100(9.8)(300)\\U=294000$

7 0

2 years ago