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3 years ago

ANSWER CORRECTLY PLEASE !!!!!!!!!!!! WILL MARK BRAINLIEST !!!!!!!!!!!!!!!!!!!!!!!

Chemistry

1 answer:

Ann [662]3 years ago

6 0

Answer:

Exothermic.

Explanation:

Exothermic is when he leaves the system. A way to remember is the "ex" which is a prefix/root/suffix or something that pretty much means leaving, I think. For example how it's in "Exodus" and "Exit", I think.

Endothermic is when it goes into the system. Similar to "ex" but with inside, I think. For example how it's in "Endoskeleton", I suppose.

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If you have 16 g of manganese (II) nitrate tetrahydrate, how much water is required to prepare 0.16 M solution from this amount

nirvana33 [79]

<u>Answer:</u> The volume of water required is 398 mL

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Mass of solute (manganese (II) nitrate tetrahydrate) = 16 g

Molar mass of manganese (II) nitrate tetrahydrate = 251 g/mol

Molarity of solution = 0.16 M

Putting values in above equation, we get:

$0.16M=\frac{16g\times 1000}{251g/mol\times \text{Volume of solution}}\\\\\text{Volume of solution}=398mL$

Hence, the volume of water required is 398 mL

7 0

3 years ago

In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery.

lys-0071 [83]

Answer: The number of moles of $Fe(OH)_2$ produced are, 3.60 moles.

Explanation :

First we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

$Fe(s)+2NiO(OH)(s)+2H_2O(l)\rightarrow Fe(OH)_2(s)+2Ni(OH)_2(aq)$

From the balanced reaction we conclude that

As, 1 mole of $Fe$ react with 2 mole of $NiO(OH)$

So, 3.60 moles of $Fe$ react with $3.60\times 2=7.2$ moles of $NiO(OH)$

From this we conclude that, $NiO(OH)$ is an excess reagent because the given moles are greater than the required moles and $Fe$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $Fe(OH)_2$

From the reaction, we conclude that

As, 1 mole of $Fe$ react to give 1 mole of $Fe(OH)_2$

So, 3.60 mole of $Fe$ react to give 3.60 mole of $Fe(OH)_2$

Therefore, the number of moles of $Fe(OH)_2$ produced are, 3.60 moles.

7 0

3 years ago

How do carbon-12 and carbon-13 differ?

Feliz [49]

Answer:

They have different amounts of neutrons.

They have different mass numbers.

Explanation:

Carbon-12 and carbon-13 are two isotopes of the element carbon. The difference between carbon-12 and carbon-13 is the number of neutrons in each atom. Atoms of both isotopes of carbon contain 6 protons. Atoms of carbon-12 have 6 neutrons, while atoms of carbon-13 contain 7 neutrons. And because the mass number is the sum of protons and neutrons in the nucleus then will be different too. Atoms of carbon-12 have the mass number equal to 12 a.m.u. while atoms of carbon-13 have the mass number equal to 13 a.m.u. .

a.m.u. - atomic mass units

8 0

3 years ago

How many particles are in chemicals

stepan [7]

Answer:

6.022 x 10^23 particles

Explanation:

Chemists have chosen to count atoms and molecules using a unit called the mole (mol), from the Latin moles, meaning “pile” or “heap.”

One mole is 6.022 x 10^23 of the microscopic particles which make up the substance in question.

Hope this helped! :^)

4 0

2 years ago

Why is co2 hard to break apart than h2o

Sergeu [11.5K]

In CO2 the dipole moments cancel out, while in H20, they don’t, making it polar. In C02, both oxygens are more electronegative than the carbon, but they pull equally apart from one another, so there is no dipole moment (the pulls cancel)

3 0

3 years ago