an electric heater having resistance equal to 5 ohm is connected to electric source . If it produces 180 J of heat in one second
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Answer:
Molar percent of sodium in original mixture is 88,50%
Explanation:
The last reaction is:
BaCl₂ + Na₂SO₄ → BaSO₄ + 2 NaCl
The moles of BaCl₂ are:
0,132L × 3,80M = 0,502 moles of BaCl₂
As the amount of BaCl₂ is the maximum possible to produce BaSO₄, the moles of BaCl₂ must be the same than moles of Na₂SO₄.
0,502 moles of BaCl₂ ≡ 0,502 moles of Na₂SO₄
These moles of Na₂SO₄ comes from:
2 Na + H₂SO₄ → Na₂SO₄ + H₂
As the reaction is in stoichiometric amounts, moles of Na are twice the moles of Na₂SO₄
0,502 moles of Na₂SO₄ ×× 22,99 g/mole = 23,08 g of Na
Molar percent of sodium in original mixture is:
= <em>88,50% </em>
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Explanation:
The given data is as follows.
Mass = 27.9 g/mol
As we know that according to Avogadro's number there are atom present in 1 mole. Therefore, weight of 1 atom will be as follows.
1 atoms weight =
In a diamond cubic cell, the number of atoms are 8. So, n = 8 for diamond cubic cell.
Therefore, total weight of atoms in a unit cell will be as follows.
=
=
Now, we will calculate the volume of a lattice with lattice constant 'a' (cubic diamond) as follows.
=
=
=
Formula to calculate density of diamond cell is as follows.
Density =
=
= 2918.1
or, = 0.0029 g/cc (as 1 )
Thus, we can conclude that density of given semiconductor in grams/cc is 0.0029 g/cc.