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In-s [12.5K]
4 years ago
12

How are energy and mass connected during the formation of an atom?

Chemistry
1 answer:
-BARSIC- [3]4 years ago
4 0
Energy is released and mass is reduced
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Calculate the concentration 3.8g of copper sulfate, CuSO4 dissolved in 250cm4 of water
11Alexandr11 [23.1K]

Answer:

Molarity = 0.08 M

Explanation:

Given data:

Mass of copper sulfate = 3.8 g

Volume of water = 250 cm³  (250/1000 = 0.25 L)

Concentration of solution = ?

Solution:

Number of moles of copper sulfate:

Number of moles = mass/molar mass

Number of moles = 3.8 g/ 159.6 g/mol

Number of moles = 0.02 mol

Concentration:

Molarity = Number of moles / volume in L

By putting values,

Molarity = 0.02 mol / 0.25 L

Molarity = 0.08 mol/L

Molarity = 0.08 M

6 0
3 years ago
List five household items that contain the same chemicals as cigarettes.
WITCHER [35]

<em>Five household items that </em><em>contain</em><em> the same chemicals as cigarettes :</em><em>-</em>

  1. <em>Perfume</em>
  2. <em>Household</em><em> </em><em>cleaning</em><em> </em><em>products</em>
  3. <em>Beauty</em><em> </em><em>Products</em>
  4. <em>Sunscreen</em>
  5. <em>Water</em><em> </em><em>bottles</em>

<em>They</em><em> </em><em>contain</em><em> </em><em>toxic</em><em> </em><em>substances</em><em>!</em>

<em>hope</em><em> </em><em>it</em><em> </em><em>helps</em><em>!</em>

5 0
3 years ago
In the periodic table of elements, some elements share similar properties and have the same number of valence electrons in their
Lilit [14]
The type of element is group
5 0
3 years ago
N2(g) + 3H2(g) →2NH3(g)
monitta

Answer:

2.5 moles of N₂ and 7.5 moles of H₂ entered the reaction

Explanation:

In reaction:

N₂(g) + 3 H₂(g) → 2 NH₃(g)

You can see that the stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) requires the following amounts of reagents and are produced:

  • N₂: 1 mole
  • H₂: 3 moles
  • NH₃: 2 moles

The following three rules can apply:

  • If 2 moles of NH₃ are produced from 1 mole of N₂ by stoichiometry of the reaction, 5 moles of NH₃ from how many moles of N₂ are produced?

moles of N_{2} =\frac{5 moles of NH_{3} *1 mole of N_{2} }{2 moles of NH_{3}}

moles of N₂= 2.5

  • If 2 moles of NH₃ are produced from 3 moles of H₂ by stoichiometry of the reaction, 5 moles of NH₃ from how many moles of H₂ are produced?

moles of H_{2} =\frac{5 moles of NH_{3} *3 mole of H_{2} }{2 moles of NH_{3}}

moles of H₂= 7.5

<u><em>2.5 moles of N₂ and 7.5 moles of H₂ entered the reaction</em></u>

6 0
3 years ago
What is the chemical formula for pentasodium dichloride?
atroni [7]
Na5Cl2
penta is 5, so 5 sodiums and di is 2, so 2 chloride
5 0
3 years ago
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