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salantis [7]
4 years ago
8

What is the mass number of the atom shown?

Chemistry
1 answer:
german4 years ago
7 0

Answer:

21

Explanation:

Formula;

Mass number = number of protons + number of neutrons

= 9 + 12

= 21

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What impact would adding twice as much na2co3 than required for stoichiometric quantities have on the quantity of product produc
inn [45]

The product will not be affected by the addition of twice as much Na₂CO₃.

<h3>What is Limiting reagent in stoichiometry ?</h3>
  • The maximum quantity of the end product determined by a balanced chemical equation is known as the Stoichiometry.
  • The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced, and the one which remains unconsumed after the final reaction is in Excess.
  • Calculate the moles of each reactant present and contrast it with the mole ratio of the reactants in the balanced equation to determine which reactant is the limiting one.

Here,taking the stoichiometry into consideration, we find that the reaction happens with 1:1 ratio; so, adding twice the amount of Na₂CO₃ will  lead to its excess making the other the limiting reactant, hence, it would not affect the yield of the product.

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4 0
2 years ago
(07.06 mc)
Slav-nsk [51]

Distilled water and sealed container are in equilibrium when these objects do not exchange more heat.

<h3>What is thermal equilibrium?</h3>

The expression 'thermal equilibrium' makes references to the phenomenon by which two objects interact with each other to exchange heat energy.

Objects in contact can transfer heat to reach a thermal equilibrium state where the temperature is the same for both objects.

In conclusion, distilled water and sealed container are in equilibrium when these objects do not exchange more heat.

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5 0
2 years ago
Examples 36
brilliants [131]

2x = 350- x

3x = 350

x = 350/x

therefore,

x = 116.67cm.

so, (350 - x)cm³ = (350- 166.67)cm³ = 233.33cm³

Hence distance covered by gas A is 116.67cm that by B is 233.33cm

5 0
4 years ago
Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several ob
kipiarov [429]

Answer:

It is c

Explanation:

7 0
3 years ago
What is the octet rule? What is it based on?
Nimfa-mama [501]

Answer: The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Explanation:

8 0
3 years ago
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