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4 years ago

Two real-world examples of things that use or are made of molecules that contain covalent bonds,

Chemistry

1 answer:

Shtirlitz [24]4 years ago

8 0

Answer:

platic papers for carrying shopping items,sythetic fibres about which we wear on by making clothes

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For the reaction given below, how many moles of nitrogen monoxide will form if we start with 2.0 moles of oxygen?

r-ruslan [8.4K]

<h3>Answer: 1.6 mol (option 5)</h3>

Explanation:

Mole Ratio of O₂ : NO

Based on the balanced equation, the mole ratio of O₂ : NO is 5 : 4

∴ for every mole of O₂ reacted, ⁴/₅ moles of NO is produced

Moles of NO

since the number of mol of O₂ = 2.0 mol

then moles of NO produced = 2.0 mol × ⁴/₅

= 1.6 mol

∴ the moles of nitrogen monoxide that will form if we start with 2.0 moles of oxygen is 1.6 mol (option 5).

7 0

3 years ago

What is the correct label for a solution?

Harlamova29_29 [7]

A homogeneous mixture (one that is the same throughout)

3 0

4 years ago

Cryolite, Na 3 AlF 6 ( s ) , Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Bal

SOVA2 [1]

Answer:

The mass of cryolite will be produced = 71247 g or, 71.247 kg

Explanation:

The balanced chemical equation for the synthesis of cryolite

Al₂O₃(s) + 6 NaOH(l) + 12 HF(g) → 2 Na₃AlF₆ + 9 H₂O(g)

6 0

3 years ago

Enter your answer in the provided box. The atomic masses of 63Cu (69.17 percent) and 65Cu (30.83 percent) are 62.94 and 64.93 am

dybincka [34]

Answer: The average atomic mass of copper is 63.55 amu.

Explanation:

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

For $_{29}^{63}\textrm{Cu}$ isotope:

Mass of $_{29}^{63}\textrm{Cu}$ isotope = 62.94 amu

Percentage abundance of $_{29}^{63}\textrm{Cu}$ = 69.17 %

Fractional abundance of $_{29}^{63}\textrm{Cu}$ isotope = 0.6917

For $_{29}^{65}\textrm{Cu}$ isotope:

Mass of $_{29}^{65}\textrm{Cu}$ isotope = 64.93 amu

Percentage abundance of $_{29}^{65}\textrm{Cu}$ = 30.83 %

Fractional abundance of $_{29}^{65}\textrm{Cu}$ isotope = 0.3083

Putting values in equation 1, we get:

$\text{Average atomic mass of Copper}=[(62.94\times 0.6917)+(64.93\times 0.3083)]\\\\\text{Average atomic mass of copper}=63.55amu$

Hence, the average atomic mass of copper is 63.55 amu.

4 0

3 years ago

What is an oxidation number?

STALIN [3.7K]

An oxidation number is the electrical charge a molecule or ion appears to have as determined by a set of arbitary rules.

7 0

4 years ago