The difference between these two chemical formulas: 4 H2O and H8O4.

Chemistry

1 answer:

Gemiola [76]1 year ago

7 0

Answer:

Explanation:

The given chemical formula is;

4H₂O H₈O₄

H₂O signifies 2 atoms of hydrogen bonding with 1 atom of oxygen

H₈O₄ signifies 8 atoms of hydrogen bonding with 4 atoms of oxygen

The 4 coefficient before H₂O signifies the number of moles.

It appears H₂O is 4 moles of water

H₈O₄ is 1 mole of the compound

The number of moles of each of the compound differs.

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Marie and Calvin dissolved 10 grams of KNO3 in 100 grams of water at 25oC. Next they added 5 grams more. Calvin told Marie that

PSYCHO15rus [73]

Hello!

Calvin told Marie that they could continue to add solute until the reached 40 grams because the solution was still unsaturated.

Unsaturated solutions are those in which the solvent (in this case water) can still dissolve more solute (in this case KNO₃) at the given pressure and temperature. This can be seen visually when adding more solute doesn't result in the presence of grains of solids that settle in the bottom of the flask. That happens because the rate of dissolving is higher than the rate of crystallization.

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2 years ago

A copper rod that has a mass of 200.0 g has an initial temperature of 20.0°C and is heated to 40.0°C. If 1,540 J of heat are nee

Romashka [77]

Heat gained in a system can be calculated by multiplying the given mass to the specific heat capacity of the substance and the temperature difference. It is expressed as follows:

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2 years ago

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Calculate the number of oxygen atoms in 2.00 moles of Mn2O7

cluponka [151]

First you should know that there is seven oxygen atoms in one Mn2O7
So
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Suppose you wanted to make a buffer of exactly ph 7.00 using kh2po4 and na2hpo4. if the final solution was 0.10 m in kh2po4, wha

OleMash [197]

Answer:- 0.138 M

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$pH=pKa+log(\frac{base}{acid})$

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The acid hase two protons(hydrogen) where as the base has only one proton. So, we could write the equation as:

$H_2PO_4^-\rightleftharpoons H^++HPO_4^-^2$

Phosphoric acid gives protons in three steps. So, the above equation is the second step as the acid has only two protons and the base has one proton.

So, we will use the second pKa value. The acid concentration is given as 0.10 M and we are asked to calculate the concentration of the base to make a buffer of exactly pH 7.00.

Let's plug in the values in the equation:

$7.00=6.86+log(\frac{base}{0.10})$