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Reika [66]
2 years ago
12

After moving down a group in the periodic table, the number of valence electrons

Chemistry
1 answer:
Delvig [45]2 years ago
8 0

the number of Valence electrons remains the same

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You are working in the lab, how many grams of solute you need to make 200.0 g of 3.4% of solution?
Goryan [66]

Answer:

6.8g of solute are needed

Explanation:

Percent by mass, (w/w%) is defined as the mass of solute in 100g of solution. A solution that is 3.4% contains 3.4g of solute in 100g of solution. That means to make 200g of solution are required:

200g solution * (3.4g solute / 100g solution) = 6.8g of solute are needed

6 0
3 years ago
What is molarity of a solution containing 0.34 moles of FeCl3 in the 0.45 liters of water
Minchanka [31]
Hello!

Molarity is defined as the number of moles of a substance that can be found in 1 liter of solution. That is expressed mathematically as M=mol/L

For the FeCl₃ solution:

M= \frac{mol FeCl_3}{L sol}= \frac{0,34 moles FeCl_3}{0,45 L}= 0,756 M

So, the concentration of this solution is 0,756 M

Have a nice day!
7 0
3 years ago
What direction are the groups (families) in the periodic table?
Soloha48 [4]

Answer:

left

Explanation:

6 0
3 years ago
Read 2 more answers
Find the number of moles in 6120 ions of NaCl . Round your answer to two decimal places. Input your answer as 1.03E23, which is
FrozenT [24]

Answer:

Explanation:

NaCl = Na⁺ + Cl⁻

6120 ions of NaCl will contain 3060 ions of Na⁺ and 3060 ions of Cl⁻ , forming 3060 molecules of NaCl .

6.02 x 10²³ molecules of NaCl = 1 mole

3060 molecules of NaCl = 3060 x 10⁻²³ / 6.02 moles

= 508.30 x 10⁻²³ moles

= 5.08 x 10⁻²¹ moles

Answer : 5.08E-21 moles  .

5 0
3 years ago
What is a change in the arrangement of bases in a gene called?????
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Asexual reproduction.<span>
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4 0
3 years ago
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