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Dimas [21]
3 years ago
6

How many moles are 7 grams of calcium oxide? (Atomic mass of Calcium - 40 u, oxygen-16 u)​

Chemistry
1 answer:
White raven [17]3 years ago
8 0

Answer:

0.125

Explanation:

no of moles = given mass / molar mass

no of moles = 7/

molar mass of calcium oxide = atomic mass of calcium + oxygen

molar mass = 40 + 16

molar mass = 56

no of moles = 7/ 56 = 1/8 = 0.125

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murzikaleks [220]

It is possible for two other resonance structures to be connected but results in positive formal charge which isn't suited for a very electronegative atom such as chlorine.

<h3>What is a Lewis structure?</h3>

This is a type of diagram which depicts the bonding between atoms and lone pairs which are present in the molecule.

Adding two other resonance structures will also result in the poor overlap between the p-orbitals.

Read more about Lewis structure here brainly.com/question/1525249

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4 0
2 years ago
If your weight is 120 pounds
denis23 [38]

Explanation:

Weight is 120 pounds and mass is 54 kg

The mass of an object is same everywhere. If we were on the moon, its mass will remain to be 54 kg.

Weight of an object is given by :

W=m\times g

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For moon, it is 1/6 the gravitational  force on Earth, g = 1.63 m/s²

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It means my weight is 533.78 N

On the surface of Moon is will be :

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5 0
3 years ago
Why has diamond has a high melting point
expeople1 [14]
Well since covalent bonds are strong and diamonds contains a lot of covalent bonds, it makes the diamond's melting point and boiling point very high.

6 0
3 years ago
Which equation best describes the net changes based upon the observation that solid silver nitrate and solid potassium chloride
stealth61 [152]

Answer:

The correct option is: AgNO₃(aq) + KCl(aq) = AgCl(s) + KNO₃(aq)  

Explanation:

Precipitation reaction is a chemical reaction that involves reaction between <em>two soluble salts to give an insoluble salt.</em> This <u>insoluble salt exists as a solid</u> and settles down.

Therefore, the solid formed in a precipitation reaction is known as the precipitate.  

As the solid silver nitrate (AgNO₃) and solid potassium chloride (KCl) are <u>soluble in water</u>, therefore, their aqueous solutions are represented as AgNO₃(aq) and KCl(aq), respectively.

The precipitation reaction of AgNO₃(aq) and KCl(aq) gives an <u>insoluble salt, silver chloride (AgCl) and a soluble salt, potassium nitrate (KNO₃).</u>

The insoluble salt, <u>AgCl is called the precipitate</u> and is represented as AgCl(s). Whereas, the <u>soluble salt</u>, KNO₃ is represented as KNO₃ (aq).

<u>Therefore, the chemical equation for this precipitation reaction is:</u>

AgNO₃(aq) + KCl(aq) → AgCl(s) + KNO₃(aq)

6 0
3 years ago
In an exothermic reaction, energy may be released to the surroundings in the form of
djverab [1.8K]
In the form of heat.
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3 years ago
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