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prohojiy [21]
3 years ago
14

Explain briefly why oxygen exists as diatonic molecules?

Chemistry
1 answer:
eimsori [14]3 years ago
6 0

Answer:

Explanation:

Oxygen generally exists as a diatomic molecule in the atmosphere when it is not combined with any other element. It forms the molecule O2 because in that configuration, it has its lowest energy level when uncombined.

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SIZIF [17.4K]

Answer: 0.9375 g

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}     .....(1)

Molarity of HCl solution = 0.75 M

Volume of HCl solution = 25.0 mL = 0.025 L

Putting values in equation 1, we get:

\text{Moles of} HCl={0.75}\times{0.025}=0.01875moles  

CaCO_3(s)+2HCl(aq)\rightarrow CaCl_2(s)+CO_2(g)+H_2O(l)  

According to stoichiometry :

2 moles of HCl require = 1 mole of CaCO_3

Thus 0.01875 moles of HCl will require=\frac{1}{2}\times 0.01875=0.009375moles  of CaCO_3

Mass of CaCO_3=moles\times {\text {Molar mass}}=0.009375moles\times 100g/mol=0.9375g

Thus 0.9375 g of CaCO_3 is required to react with 25.0 ml of 0.75 M HCl

6 0
3 years ago
What mass of silver chloride precipitate will be produced if 25 cm3 of 0.1M silver nitrate is added to excess sodium chloride so
ehidna [41]

We have 25cm^3 of 0.1mol AgNO3.

25cm^3 = 0.025L, so we have 0.025 x 0.1 = 0.0025mol AgNO3, so

0.0025AgNO3 + 0.0025NaCl = 0.0025AgCl + 0.0025NaNO3

Change in Free Energy: ΔG(20C) = -0.064kJ (negative, so the reaction runs)

Change in Enthalpy: ΔH(20C) = -0.110kJ (negative, so the reaction is exothermic)

This reaction produces 0.358g of AgCl and 0.213g of NaNO3

Les Mclean PhD

6 0
2 years ago
Which of the statements correctly describes the reactivity of halogens, according to the octet rule?
zzz [600]
They have seven electrons in their valence shell, so halogens are very reactive.
Hope this helps! :)
8 0
3 years ago
Read 2 more answers
Can someone help me with this?
Doss [256]
He was involved in the mapping of venus and mars  
5 0
3 years ago
SEP Design Solutions You are given an unknown solution and asked to determine whether it is an acid or a base. What properties o
solong [7]

Answer:

Extensive properties, such as mass and volume depend on the amount of substance present and are not useful in the identification of a substance. In this experiment, we will use three properties to identify a liquid substance: solubility, density and boiling point.

7 0
3 years ago
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