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Advocard [28]
4 years ago
12

How the atomic model used by Aristotle was proposed

Chemistry
1 answer:
Semenov [28]4 years ago
7 0
Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter.
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How many total atoms are there in 69.1 g of ammonia (NH3)?​
lozanna [386]

Answer:

answers is - 3.568

I think this correct answer

5 0
3 years ago
Boron has an average atomic mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percen
Georgia [21]
The average atomic mass is calculated by the expression:

Average atomic mass = Σzₓ(Aₓ)

where zₓ is the relative abundance of an isotope and Aₓ is the atomic mass of the isotope. 

We calculate the mass of the isotope as follows:

10.81 = .1980 (10.012938) + .8020 (x)
x = 11.00 -----------> mass of the isotope

8 0
3 years ago
Read 2 more answers
What volume does 1.5 x 10^24 molecules of CO2 occupy at STP?
Nookie1986 [14]

Answer:

The volume occupied by given molecules of carbon dioxide at STP is 55.86 L.

Explanation:

N=n\times N_A

Where:

N = Number of particles / atoms/ molecules

n = Number of moles

N_A=6.022\times 10^{23} mol^{-1} = Avogadro's number

We have:

N = 1.5\times 10^{24}

n =?

n=\frac{N}{N_A}=\frac{1.5\times 10^{24}}{6.022\times 10^{23} mol^{-1}}

n = 2.4909 moles

Using ideal gas equation:

PV = nRT

where,

P = Pressure of carbon dioxide gas = 1 atm  (at STP)

V = Volume of carbon dioxide gas = ?

n = number of moles of carbon dioxide gas =2.4909 mol

R = Gas constant = 0.0821 L.atm/mol.K

T = Temperature of carbon dioxide gas = 273.15 K  (at STP)

Putting values in above equation, we get:

V=\frac{2.4909 mol\times 0.0821 atm L/mol K\times 273.15 K}{1 atm}

V = 55.86 L

The volume occupied by given molecules of carbon dioxide at STP is 55.86 L.

7 0
3 years ago
How many hydrogen bonds are between cytosine and guanine
Lerok [7]

Answer:

Three

Explanation:

Three hydrogen bonds are between guanine and cytosine base pairs

Hopefully, that helps!

5 0
2 years ago
2503(g) → 2502(g) O2(g)
Verizon [17]

Answer:

7.146

Explanation:

use the equilibrium equation

6 0
3 years ago
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