Answer:
A. Second
Explanation:
The Si unit of time is second
<span>Carbohydrates have 4 kcal per gram of carbohydrates. (Protein is also 4 kcal/gram, while fat is 9 kcal/gram).
Take the total kcal and divide by 4 kcal/gram: 72 kcal/(4 kcal/gram) = 18 grams carbohydrates.</span>
Answer:
the number of moles of the gas is 0.00174 mol.
Explanation:
Given;
temperature of the, T = 300 K
volume of the gas, V = 1.45 L
Pressure of the gas, P = 3.0 kPa
The number of moles of the gas is calculated using Ideal gas equation, as follows;
PV = nRT
Where;
n is number of moles of the gas
R is the ideal gas constant, = 8.315 L.kPa/mol.K
n = PV / RT
n = (3 x 1.45) / (8.315 x 300)
n = 0.00174 mol.
Therefore, the number of moles of the gas is 0.00174 mol.
Answer:
Potassium = 4s¹
Carbon = 2p²
Sulfur = 3p⁴
Barium = 6s²
Xenon = 5p⁶
Explanation:
1) Potassium is present in group one.
Its electronic configuration is:
K = [Ar] 4s¹
So its highest energy electrons are 4s¹.
2) Carbon is present in group 14.
Its electronic configuration is:
C = [He] 2s² 2p²
So its highest energy electrons are 2p².
3) Sulfur is present in group 16.
Its electronic configuration is:
S = [Ar] 3s² 3p⁴
So its highest energy electrons are 3p⁴.
4) Barium is present in group 2.
Its electronic configuration is:
Ba = [Xe] 6s²
So its highest energy electrons are 6s² .
5) Xenon is present in group 18.
Its electronic configuration is:
Xe= [Kr] 4d¹⁰ 5s² 5p⁶
So its highest energy electrons are 5p⁶
Balance Fe
Fe3O4 + H2→ 3Fe + H2O
Balance O
Fe3O4 + H2→ 3Fe + 4H2O
Balance H
Fe3O4 + 4H2→ 3Fe+4H2O
Coeff of H2O=4
