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2 years ago

Chemistry acids and bases

Chemistry

1 answer:

Ket [755]2 years ago

4 0

Answer:

Imma just say acids have more acidity and bases have lower acidity...

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What do you call a small rocky or metallic object that has crashed on the surface of the Earth?

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2 years ago

Which shows the correct relationship?

Deffense [45]

The correct answer is option B. i.e. E°cell > 0 = spontaneous reaction.

The spontaneous reactions always have positive voltage and the energy released in the reaction is used up to do work.

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2 years ago

When 27.50 liters of oxygen gas reacts with excess hydrogen gas at STP how many grams of water is produced?

telo118 [61]

<u>Answer: </u>The mass of water produced is 44.28 g

<u>Explanation:</u>

We are given:

Volume of oxygen gas = 27.50 L

At STP conditions:

22.4 L of volume is occupied by 1 mole of a substance

27.50 L of oxygen gas will be occupied by = $\frac{1mol}{22.4L}\times 27.50L=1.23mol$

The chemical equation for the formation of water follows:

$2H_2+O_2\rightarrow 2H_2O$

By the stoichiometry of the reaction:

If 1 mole of oxygen gas produces 2 moles of water

So, 1.23 moles of oxygen gas will produce = $\frac{2}{1}\times 1.23=2.46mol$ of water

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Molar mass of water = 18 g/mol

Plugging values in equation 1:

$\text{Mass of water}=(2.46mol\times 18g/mol)=44.28g$

Hence, the mass of water produced is 44.28 g

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2 years ago

What type of star has an absolute brightness of 1 and a surface temperature around 7,500 ∞C

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2 years ago

The heat vaporization of water is 40.66 kj/mol . .? The heat vaporization of water is 40.66 kj/mol. How much heat is absorbed wh

Gelneren [198K]

To answer the question above, first convert the given amount of water from grams to mol by dividing it with its molar mass which is 18 g/mol.
amount in mol = 3.45 g x (mol/ 18 g) = 23/120 mol
Then, multiply this amount in mol with the heat of vaporization given.
(23/120) mol x (40.66 kj/mol) = 7.793 kJ
Thus, the heat absorbed is approximately equal to 7.793 kJ.

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2 years ago