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liraira [26]
3 years ago
10

PLEASE HELP MEEE THIS NEEDS TO BE DONE IN HALF AN HOUR :(

Chemistry
1 answer:
AveGali [126]3 years ago
4 0
D is the answer.Brainliest?!?
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A sample of phosphorus-32 has a half-life of 14.28 days. If 55 g of this radioisotope remain unchanged after approximately 57 da
Flura [38]
55= No (1/2)^55/57
55= No (1/2)^3.9
55= No (1/2)^4
55= No (1/16)
No= 880 g
7 0
3 years ago
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In process in which An animal's cells use oxygen and digested food molecules to release the energy in food is called
mamaluj [8]
In process in which An animal's cells use oxygen and digested food molecules to release the energy in food is called

cellular respiration
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3 years ago
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Dinitrogen pentoxide is used in the preparation of explosives. If 7.93 mol of
Tpy6a [65]

The volume of O₂ produced: 84.6 L

<h3>Further explanation</h3>

Given

7.93 mol of  dinitrogen pentoxide

T = 48 + 273 = 321 K

P = 125 kPa = 1,23365 atm

Required

Volume of O₂

Solution

Decomposition reaction of dinitrogen pentoxide

2N₂O₅(g)→4NO₂(g)+O₂ (g)

From the equation, mol ratio N₂O₅ : O₂ = 2 : 1, so mol O₂ :

= 0.5 x mol N₂O₅

= 0.5 x 7.93

= 3.965 moles

The volume of O₂ :

\tt V=\dfrac{nRT}{P}\\\\V=\dfrac{3.965\times 0.082\times 321}{1.23365}\\\\V=84.6~L

5 0
3 years ago
A covalent bond is likely to be polar when ________. one of the atoms sharing electrons is more electronegative than the other a
nekit [7.7K]

Answer:

one of the atoms sharing electrons is more electronegative than the other atom

Explanation:

3 0
3 years ago
Virus Multiplication-Viruses can make copies of themselves only inside a living____cell.
shutvik [7]

Answer:

Host

Explanation:

Viruses are not alive. They need a living host cell to reproduce.

4 0
2 years ago
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