Answer:
first one
Explanation:
NO ..oxidisation number is +2 and it is reduced to -3 in NH3
H2 oxidisation number is 0 and its oxidized to +1 in H2O
Answer: Which Group 1A elements are less dense than pure water at 4 degrees C? Li Na K. How does density vary with temperature? Temperature up, density down.
Explanation:
Moles of Sulfuric acid needed to react completely : 3.2
<h3>Further explanation</h3>
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
Reaction (balanced)
<em>H₂SO₄ (aq) + 2 LiOH (aq) ⇒ Li₂SO₄ (aq) + 2 H₂O (l)</em>
moles of LiOH = 6.4
From equation, mol ratio of H₂SO₄ : LiOH = 1 : 2, so mol H₂SO₄ :
![\tt mol=\dfrac{1}{2}\times 6.4=3.2](https://tex.z-dn.net/?f=%5Ctt%20mol%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%206.4%3D3.2)
Answer:
1.67 M
Explanation:
The following data were obtained from the question:
Initial volume (V1) of solution = 250 mL
Initial Molarity (M1) of solution = 0.5 M
Final volume (V2) of solution = 75 mL
Final Molarity (M2) of solution =?
Thus, we can obtain the final molarity of the solution by using the following formula:
M1V1 = M2V2
0.5 × 250 = M2 × 75
125 = M2 × 75
Divide both side by 75
M2 = 125 /75
M2 = 1.67 M
Thus, the new Molarity of the solution is 1.67 M.