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2 years ago

I am one percent away from failing. I just need help. No false answers

Chemistry

1 answer:

Basile [38]2 years ago

6 0

Answer:

I did it in steps in the picture I just hope it helps you to understand:)

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If you have 20.0 g of CO2, how many atoms of Oxygen (O) are present in the sample?

Alecsey [184]

Answer:

20 g of CO₂ have 5.47x10²³ oxygen atoms

Explanation:

1 mol of CO₂ has 1 mol of C and 2 moles of O.

Mass / Molar mass = Moles

20 g / 44 g/m = 0.454 moles

In 1 mol we find 2 moles of O

In 0.454 moles of CO₂, we will find ( 0.454 .2) = 0.909 moles

1 mol has _____ 6.02x10²³ atoms

0.909 moles have (0.909 . 6.02x10²³) = 5.47x10²³ atoms

7 0

3 years ago

How would you test to find out if<br> indigestion tablets are better than using<br> baking powder?

Orlov [11]

Go here and see how:
http://www.rsc.org/learn-chemistry/resource/res00000698/using-indigestion-tablets-to-neutralise-an-acid?cmpid=CMP00005978

7 0

4 years ago

The atomic radius of a gold atom is 144×10^-12. The volume of a gold atom can be calculated using the volume of a sphere. The de

Alekssandra [29.7K]

Given:
Atomic radius of gold = 144 x 10⁻¹² m = 144 pm
Density of gold = 19.3 g/cm³ = 19.3 x 10⁻³ kg/cm³
Mass of gold sample = 1.40 g = 1.4 x 10⁻³ kg

Calculate the volume of an atom.
v = [(4π)/3]*(144 x 10⁻¹² m)³ = 1.2508 x 10⁻²⁹ m³

Calculate the mass of an atom.
$m=(1.2508\tmes10^{-29}\,m^{3})*(19.3\times 10^{-3}\, \frac{kg}{cm^{3}} )*(10^{2}\, \frac{cm}{m})^{3} \\ = 2.4142 \times 10^{-25} \, kg$

Calculate the number of atoms in a sample of mass 1.40 g.
$N = \frac{1.40 \time 10^{-3} kg}{2.4142 \times 10^{-25} \, \frac{kg}{atom} } =5.8 \times 10^{21} \, atoms$

Answer: 5.8 x 10²¹ atoms

3 0

3 years ago

F the ph of blood drops, one would expect _____. One of the buffers that contribute to ph stability in human blood is carbonic a

svetlana [45]

Answer is: the HCO3⁻ to act as a base and remove excess H⁺ by the formation of H₂CO₃.

Dissociation of carbonic acid: H₂CO₃(aq) ⇄ HCO₃⁻(aq) + H⁺(aq).

Adding acid: HCO₃⁻(aq) + H⁺(aq ⇄ H₂CO₃(aq).

A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

3 0

3 years ago

Which of the following bonds connect amino acids in the primary structure of a protein?:

hoa [83]

Answer:

C.Peptide bonds

Explanation:

The amino acids in the protein structure are linked by peptide bonds.

These bonds join the alpha carboxylic group of one amino acid to the alpha amino group of another amino acid. This forms a chain called the amino sequence

3 0

3 years ago