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2 years ago

What electrically neutral atom has 30 neutrons and 25 electrons?

Chemistry

1 answer:

Black_prince [1.1K]2 years ago

7 0

Answer:

Manganese (Mn)

Explanation:

We know it's manganese because we are told it is an electrically neutral atom. This means it has the same number of protons and electrons. If it has 25 electrons, it has 25 protons. Protons tell us the atomic number of the atom, which also tells us the name of the element. Manganese is element 25 on the periodic table.

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T he thermochemical equation for the reaction between hydrazine, N2H4, and dinitrogen tetroxide is given as: 2N2H4(2) N204 (1) 3

SpyIntel [72]

Answer:

4N2H4(2) + 2N204 (1) --> 6N2 (g) + 8H20 (g), AHO-2098 kJ

Explanation:

2N2H4(2) + N204 (1) --> 3N2 (g) + 4H20 (g),AHO-1049 kJ

when 6 mol of nitrogen are formed?

The ratio of Nitrogen in the previous therrmochemical equation to when 6 mol f nitrogen are formed is 2; 6/3 = 2.

So to get the new thermoochemical equation, multiply all parameters in the given equation by 2.

We have;

4N2H4(2) + 2N204 (1) --> 6N2 (g) + 8H20 (g), AHO-2098 kJ

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2 years ago

What is the concentration of a solution formed by mixing 89.94 grams of cobalt (II)

bezimeni [28]

Answer:

0.47 M

Explanation:

The concentration of the solution can be calculated using the following equation:

$C = \frac{\eta}{V} = \frac{m}{M*V}$

<u>Where:</u>

V: is the volume of the solution = 68.6x10⁻² L

η: is the moles of cobalt (II) sulfate

m: is the mass of cobalt (II) sulfate = 89.94 g

M: is the molar mass of cobalt (II) sulfate = 281.103 g/mol

The concentration of cobalt (II) sulfate is:

$C = \frac{m}{M*V} = \frac{89.94 g}{281.103 g/mol*68.6 \cdot 10^{-2} L} = 0.47 mol/L$

We used the molar mass of the cobalt (II) sulfate heptahydrate (281.103 g/mol) since it is one of the most common salts of cobalt.

Therefore, the concentration of a solution of cobalt (II) sulfate is 0.47 M (assuming that the cobalt (II) sulfate is heptahydrate).

I hope it helps you!

3 0

2 years ago

Read 2 more answers

____________ is a point source of water pollution; _____________ is a nonpoint source of water pollution.

Deffense [45]

Answer:

good afternoon

Explanation:

thanks I will send

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2 years ago

Atoms of a substance are rearranged _______.

Yanka [14]

Atoms are never rearranged

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2 years ago

I need a background information for this report it's due tomorrow and I'm having difficulty with it please help

Whitepunk [10]

Try using Google Scholar. It'll show you tons of educational resources on topics you look up. Good luck with your report! Hope this helps!

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3 years ago