Answer:
1.46L
Explanation:
2Na + 2H2O —> H2 + 2NaOH
Molar Mass of Na = 23g/mol
Mass of Na from the question = 3g
Number of mole of Na = Mass /Molar Mass
Number of mole of Na = 3/23
Number of mole of Na = 0.130mol
From the equation,
2moles of Na produced 1mole of H2.
Therefore, 0.130mol of Na will produce = 0.130/2 = 0.065mol of H2.
Recall: 1mole of a gas occupy 22.4L at stp.
If 1 mole of H2 occupy 22.4L at stp,
Then 0.065mol of H2 will occupy = 0.065 x 22.4 = 1.46L
the correct answer is the first answer Losing one electron from the third energy level
Answer:
D. A change of appearance
