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schepotkina [342]
2 years ago
11

Elements in the same period have _____.

Chemistry
2 answers:
faust18 [17]2 years ago
4 0

Ans: Elements in the same period have the same number of electron shells.

Svetllana [295]2 years ago
4 0
It would be 2 -the same number of electrons shells
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Which type of nuclear radiation is being emitted here?
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3 years ago
When magnesium reacts with hydrochloric acid, hydrogen gas is formed: 2HCl + Mg → H2 + MgCl2. What is the volume of hydrogen pro
Maksim231197 [3]

Answer:- C. 16.4 L

Solution:- The given balanced equation is:

2HCl+Mg\rightarrow H_2+MgCl_2

From this equation, there is 2:1 mol ratio between HCl and hydrogen gas. First of all we calculate the moles of hydrogen gas from given grams of HCl using stoichiometry and then the volume of hydrogen gas could be calculated using ideal gas law equation, PV = nRT.

Molar mass of HCl = 1.008 + 35.45 = 36.458 gram per mol

The calculations are shown below:

49.0gHCl(\frac{1molHCl}{36.458gHCl})(\frac{1molH_2}{2molHCl})

= 0.672molH_2

Now we will use ideal gas equation to calculate the volume.

n = 0.672 mol

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P = 101.3 kPa = 1 atm

R = 0.0821\frac{atm.L}{mol.K}

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1(V) = (0.672)(0.0821)(298)

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