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3 years ago

Which of these chemical formulas represents both an element and a molecule?

2 answers:

8 0

O2.

Because it is only made up of one type of element it is an element. Howevern there is more than one oxygen atom because oxygen cannot exist as a single atom, therefore making it a molecule as well.

anastassius [24]3 years ago

6 0

Answer:

Explanation:

The other answer on here has a wonderful explanation! :D I just wanted to confirm. :)

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Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO Rig

BigorU [14]

Taking into account the reaction stoichiometry, the correct answer is the third option: 15.63 moles of HgO are needed to produce 250 g of O₂.

In first place, the balanced reaction is:

2 HgO → 2 Hg + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

HgO: 2 moles
Hg: 2 moles
O₂: 1 moles

The molar mass of the compounds is:

HgO: 216.59 g/mole
Hg: 200.59 g/mole
O₂: 32 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

HgO: 2 moles× 216.59 g/mole= 433.18 grams
Hg: 2 moles× 200.59 g/mole= 401.18 grams
O₂: 1 mole× 32 g/mole= 32 grams

Then the following rule of three can be applied: if by reaction stoichiometry 32 grams of O₂ are produced by 2 moles of HgO, 250 grams of O₂ are produced from how many moles of HgO?

$moles of HgO=\frac{250 grams of O_{2} x2 moles of HgO}{32grams of O_{2}}$

<u><em>moles of HgO= 15.625 moles≅ 15.63 moles</em></u>

Finally, the correct answer is the third option: 15.63 moles of HgO are needed to produce 250 g of O₂.

Learn more about reaction stoichiometry:

5 0

3 years ago

At what phase of the cell cycle does the genetic material double?

natka813 [3]

There are the four phases of the cell cycle. M, G1, S and G3. And in S (Synthesis) phase genetic material is doubled.

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3 years ago

PLEASE HELP ME ASAP WITH THIS QUESTION!

Mariana [72]

Answer:

has very few trees

has cool and rainy winters

has dense shrubs and grasses

Explanation:

I've done this before! Good luck!

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3 years ago

Compare the mass number and atomic number for isotopes of an element

Zanzabum

An isotope is when there is same amount of atomic number but different mass number. It also mean that only the number of neutrons changes if there is an isotope present.

3 0

3 years ago

) write the balanced equation for the reaction that occurs when methanol, ch3oh (l), is burned in air. what is the coefficient o

MaRussiya [10]

2CH₃OH(l) + 3O₂(g) → 2CO₂(g) + 4H₂O(g)

k(O₂)=3

3 0

4 years ago

Read 2 more answers