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3 years ago

Molecules can be composed of plzzzzzzzzzzzz help me fast im giving 89 pts

1 answer:

8 0

Molecules made up of two or more elements are called compounds. Water, calcium oxide, and glucose are molecules that compound.

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Freezing point depression is:

CaHeK987 [17]

The answer to this question is D

5 0

4 years ago

Describe how physical and chemical change may have affected by temperature

stepladder [879]

The heat changes the physical structure into a chemical structure because some of the cells in the physical structure are removed to make that physical structure a chemical structure

7 0

4 years ago

Read 2 more answers

Methane is the major component of natural gas. The standard molar enthalpy of formation of methane CH4 is -74.9 kJ/mol. For the

arlik [135]

Answer:

$\Delta _rH=-802.2kJ/mol$

Explanation:

Hello!

In this case, according to the given chemical reaction, it is possible to calculate the enthalpy change of the reaction via:

$\Delta _rH=\Delta _fH_{CO_2}+2\Delta _fH_{H_2O}-\Delta _fH_{CH_4}$

Since the enthalpy of formation of oxygen is 0. Thus, given the enthalpies of formation of gaseous carbon dioxide and water, we obtain:

$\Delta _rH=(-393.5kJ/mol)+2(-241.8kJ/mol)-(-74.9kJ/mol)\\\\\Delta _rH=-802.2kJ/mol$

Best regards!

3 0

3 years ago

Find the molarity of a 500 L solution that contains 10 moles of fluorine.

deff fn [24]

Given :-

Number of moles = 10
Volume of solution = 500L

To Find :-

Molarity of the solution .

Solution :-

As we know that ,

$\longrightarrow Molarity (M )=\dfrac{Number\ of \ moles \ of \ solute }{Volume\ of \ solution\ (in \ L) }$

Substitute ,

$\longrightarrow M =\dfrac{10}{500L}$

Simplify,

$\longrightarrow M = \dfrac{1}{50}$

Convert into decimal ,

$\longrightarrow \underline{\underline{ M = 0.02 \ mol \ L^{-1}}}$

This is the required answer .

3 0

2 years ago

Phosphorus pentachloride reacts with water to form hydrochloric acid and phosphoric acid. How many total moles of acid are forme

klio [65]

Answer:

0,13 moles of acid are produced

Explanation:

The reaction of the problem is:

PCl₅ + 4H₂O → 5HCl + H₃PO₄

Based on the reaction, 1 mole of PCl₅ produces 6 moles of acid (5 moles of HCl + 1 mole of H₃PO₄).

The molecular mass of PCl₅ is:

1P = 30,97g/mol + 5Cl = 5×35,45g/mol = 208,24 g/mol

That means 4,5g of PCl₅ are:

4,5g PCl₅×(1mol / 208,24g) = 0,0216 moles of PCl₅. As 1 mole of PCl₅ produces 6 moles of acid, 0,0216 moles of PCl₅ produce:

0,0216 moles PCl₅ × (6 moles acid / mole of PCl₅) =

0,13 moles of acid are produced

I hope it helps!

3 0

3 years ago