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3 years ago

Differentiate between short period and long period in modern periodic table

2 answers:

8 0

The difference between short period and long period is based upon the number of elements in each period. Shortest period is the first period which contains elements, while the longest period is the 6th period which contains 32 elements.

Radda [10]3 years ago

5 0

Both these contain 18 elements each. The shortest period which contains two elements, while the longest period is the 6th period which contains 32 elements.

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2 years ago

Calculate the moles and grams of solute in 2.0 L of 0.30M Na SO..

Ostrovityanka [42]

Answer:

Number of moles of solute = 0.6 mole

Mass =13.8 g

Explanation:

Given data:

Number of moles of sodium = ?

Volume = 2.0 L

Molarity = 0.30 M

Mass in gram of sodium= ?

Solution:

Number of moles:

Molarity = number of moles of solute / volume in litter

Number of moles of solute = Molarity × volume in litter

Number of moles of solute = 0.30 M × 2.0 L

Number of moles of solute = 0.6 mole

Mass in gram:

Mass = Number of moles × molar mass

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3 0

3 years ago

Compound B contains 92.31% carbon and 7.69% hydrogen. Determine the empirical formula of B

tester [92]

Answer:C H

Explanation:

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3 years ago

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Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode

mylen [45]

Answer:

696 h

Explanation:

Let's consider the reduction of Cr³⁺.

Cr³⁺(aq) + 3e⁻ → Cr(s)

We can establish the following relations.

The molar mass of Cr is 52.0 g/mol.
1 mol of Cr is deposited when 3 moles of e⁻ circulate.
1 mole of e⁻ has a charge of 96468 c (Faraday's constant).
1 A = 1 c/s
1 h = 3600 s

How many hours will it take to plate 13.5 kg of chromium onto the cathode if the current passed through the cell is held constant at 30.0 A?

$13.5 \times 10^{3} gCr.\frac{1molCr}{52.0gCr} .\frac{3mol/e^{-} }{1molCr} .\frac{96468c}{1mol/e^{-}} .\frac{1s}{30.0c} .\frac{1h}{3600s} =696 h$

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3 years ago

Differentiate between short period and long period in modern periodic table​

Differentiate between short period and long period in modern periodic table