Answer:
Avogadro's law, a statement that under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules.
The solid portion of a comet—the only portion that exists when the comet is far from the Sun.
Answer:
The molarity of the solution is 1, 23 M.
Explanation:
We calculate the weight of 1 mol of NaCl from the atomic weights of each element of the periodic table. Then, we calculate the molarity, which is a concentration measure that indicates the moles of solute (in this case NaCl) in 1000ml of solution (1 liter)
Weight 1 mol NaCl= Weight Na + Weight Cl= 23 g + 35, 5 g= 58, 5 g
58, 5 g-----1 mol NaCl
89,94 g ---------x= (89,94 g x 1 mol NaCl)/58, 5 g= 1,54 mol NaCl
1249 ml solution------ 1,54 mol NaCl
1000ml solution------x= (1000ml solutionx 1,54 mol NaCl)/1249 ml solution
x=1,23 mol NaCl---> The solution is 1, 23 molar (1,23 M)
Answer:
2.63×10²² atoms
Explanation:
From the question given above, the following data were obtained:
Mass of calcium (Ca) = 1.75 g
Number of atoms of calcium (Ca) =?
From Avogadro's hypothesis,
1 mole of Ca = 6.02×10²³ atoms
Recall:
1 mole of Ca = 40 g
Thus,
40 g of Ca = 6.02×10²³ atoms
Finally, we shall determine the number atoms in 1.75 g of calcium. This can be obtained as follow:
From Avogadro's hypothesis,
40 g of Ca = 6.02×10²³ atoms
Therefore,
1.75 g of Ca = 1.75 × 6.02×10²³ / 40
1.75 g of Ca = 2.63×10²² atoms
Thus, 1.75 g of Ca contains 2.63×10²² atoms.
H₂O₂ + 2FeSO₄ + H₂SO₄ → Fe₂(SO₄)₃ + 2H₂O
H₂O₂ + 2H⁺ + 2e⁻ → 2H₂O k=1
Fe²⁺ → Fe³⁺ + e⁻ k=2
H₂O₂ + 2H⁺ + 2Fe²⁺ → 2H₂O + 2Fe³⁺
