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motikmotik
3 years ago
8

What are things that we use that are made of the elements on the periodic table

Chemistry
1 answer:
mylen [45]3 years ago
6 0

Answer:

all matter (everything) is made of the elements on the periodic table

Explanation:

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I think it’s the inner membrane
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3 years ago
In a study designed to prepare new gasoline-resistant coatings, a polymer chemist dissolves 6.143 g poly(vinyl alcohol) in enoug
Ghella [55]

Answer:

MM = 5,521.54 g/mol

Explanation:

To solve this, we need to use the expression for osmotic pressure which is the following:

π = MRT (1)

Where:

M: Concentration of the solution

R: gas constant (0.082 L atm/ mol K

T: temperature in K

25 °C in Kelvin is: 25 + 273.15 = 298.15 K

Now, we do not have the concentration of the solution, but we do have the mass. and the concentration can be expressed in terms of mass, molar mass and volume:

Concentration (M) is:

M = n/V (2)

and n (moles) is:

n = m/MM (3)

Therefore, if we replace (2) and (3) in (1) we have:

π = mRT/V*MM

Solving for MM we have:

MM = mRT/πV (4)

All we have to do now, is replace the given data and we should get the value of the molar mass:

MM = 6.143 * 0.082 * 298.15 / 0.1 * 0.272

MM = 150.1859 / 0.0272

<em>MM = 5,521.54 g/mol</em>

<em>This is the molar mass.</em>

7 0
3 years ago
(As) in noble-has notion
vaieri [72.5K]

Answer:

[Ar] 4s2 3d10 4p3

Explanation:

Arsenic is Element 33. It is the 15th element in the Fourth Row, following the noble gas Ar at the end of the Third Row.

Thus, its noble gas electron configuration is

[Ar] 4s2 3d10 4p3

4 0
4 years ago
A chemist weighed out 49.0 g of calcium. Calculate the number of moles of calcium she weighed out. Be sure your answer has the c
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Answer:

1.22 mol Ca

Explanation:

Molar mass (Ca)=40.1 g/mol

49.0 g* 1 mol/40.1 g ≈ 1.22 mol Ca

7 0
3 years ago
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B. Earths Moon is the answer.


Hope it helped!


3 0
3 years ago
Read 2 more answers
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