3 years ago

Work done by a system is positive or negative?

1 answer:

6 0

The internal energy has the symbol U. Q is positive if heat is added to the system, and negative if heat is removed;

....."W is positive if work is done by the system"........

and negative if work is done on the system.

So, work done by a system is positive.

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Which of these solutes raises the boiling point of water the most?

lubasha [3.4K]

(E) ionic aluminum fluoride (AlF3)

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3 years ago

If you have 6.25g of O2, how many moles of H2O are produced?

denis23 [38]

Answer:

0.4 moles of water produced by 6.25 g of oxygen.

Explanation:

Given data:

Mass of oxygen = 6.25 g

Moles of water produced = ?

Solution:

Chemical equation;

2H₂ + O₂ → 2H₂O

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 6.35 g/ 32 g/mol

Number of moles = 0.2 mol

Now we will compare the moles of oxygen with water:

O₂ : H₂O

1 : 2

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3 years ago

The seeds of a dandelion are wispy and very light. A single dandelion produces many seeds. How does the structure of the seeds r

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Answer:

the answer will be number...D

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3 years ago

Which valid empercal formula below would have one. Five times as much oxygen as there is gold in the substance

stealth61 [152]

Answer:

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Explanation:

See attachment.

3 0

2 years ago

The ph of a fruit juice is 2.2 . find the hydronium ion concentration, left bracket upper h 3 upper o superscript plus right br

patriot [66]

Answer:

[H₃O⁺] = 6.31 x 10⁻³ M.

Explanation:

To find the hydronium ion concentration [H₃O⁺], we can use the relation:

pH = - log[H₃O⁺].

∴ 2.2 = - log[H₃O⁺].

∴ log[H₃O⁺] = - 2.2

∴ [H₃O⁺] = 6.31 x 10⁻³ M.

3 0

3 years ago