Which of the following has more atoms 3.14 g Cu or 1.10 g of H? Explain

1 answer:

8 0

63.5 gm cu contain 6.02*10^23 molec
1 gm cu contain 6.02*10^23/63.5
3.14 gm contain 6.02*10^23*3.14/63.5

similary in case of H2
1.10*6.02*10^23/2

then you can compare the result

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A pure substance containing only one kind of ____________. an element is always uniform all the way through (homogeneous). an el

Anuta_ua [19.1K]

1. A pure substance containing only one kind of atom.

When a substance has more than one kind of atoms, it would be called a compound. A pure substance can be made out of an element or compound as long as there is only one kind of them, but this question seems to ask about elements.

2. An element is always uniform all the way through (homogeneous).
An element cannot be separated into simpler materials (except during nuclear reactions).

An element is the simplest form of material that can't be separated. The example would be oxygen(O2) or hydrogen(H2). An element doesn't mean it contains 1 atom because many of the stable structure made of 2 or more atoms. Normally, you cant separate O2 into two oxygen atoms.

<span>3. Over 100 existing elements are listed and classified on the periodic table.
The periodic table used to classify element and make it easier to understand. The classification based on the atomic number and the electron configuration of the elements.
The element in the same column could have similar traits so that they can be put into a group.</span>

8 0

4 years ago

The surface area of an object to be gold plated is 49.8 cm2 and the density of gold is 19.3 g/cm-3. A current of 3.15. A is appl

garik1379 [7]

Answer: Time required to deposit an even layer of gold with given thickness is $5.3 \times 10^{2}$ sec.

Explanation:

The given data is as follows.

Surface area = 49.8 $cm^{2}$ ,

Density of gold = 19.3 $g/cm^{3}$ ,

Current = 3.15 A, thickness of gold layer = $1.2 \times 10^{-3} cm$

It is known that relation between volume, area and thickness is as follows.

V = Surface area × Thickness

= $49.8 \times 1.2 \times 10^{-3} cm$

= 0.05988 $cm^{3}$

Therefore, we will calculate the time required to deposit an even layer of gold with given thickness is calculated as follows.

$0.05988 \times cm^{3} \times \frac{19.3 g Au}{1 cm^{3}} \times \frac{1 mol Au}{197 g Au} \times \frac{3 mol e^{-}}{1 mol Au} \times \frac{96485}{1 mol e^{-}} \times \frac{1 As}{1 C} \times \frac{1}{3.20 A}$

= $5.3 \times 10^{2}$ sec

Thus, we can conclude that time required to deposit an even layer of gold with given thickness is $5.3 \times 10^{2}$ sec.

4 0

3 years ago

Which structural formula does not represent benzene? a hexagon with nothing drawn inside it a hexagon with a dotted circle drawn

boyakko [2]

Answer:
<span>A hexagon with nothing drawn inside it does not represent Benzene.

Explanation:

Below attached picture contains structures mentioned in given option.

Structure of Option-A is shown in Red Color.
</span>
Structure of Option-B is shown in Blue Color.

Structure of Option-C is shown in Green Color.

Structure of Option-D is shown in Orange Color.

Result:
Except Option-A, all structures represent Benzene. Option-A in fact shows the structure of Cyclohexane.