Answer:
0.259 kJ/mol ≅ 0.26 kJ/mol.
Explanation:
- To solve this problem, we can use the relation:
<em>Q = m.c.ΔT,</em>
where, Q is the amount of heat absorbed by ice (Q = ??? J).
m is the mass of the ice (m = 100.0 g).
c is the specific heat of water (c of ice = 4.186 J/g.°C).
ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 21.56°C - 25.0°C = -3.44°C).
<em>∵ Q = m.c.ΔT</em>
∴ Q = (100.0 g)(4.186 J/g.°C)(-3.44°C) = -1440 J = -1.44 kJ.
<em>∵ ΔH = Q/n</em>
n = mass/molar mass = (100.0 g)/(18.0 g/mol) = 5.556 mol.
∴ ΔH = (-1.44 kJ)/(5.556 mol) = 0.259 kJ/mol ≅ 0.26 kJ/mol.
Always remember that pH + pOH = 14
Here, you have a pOH of 11.24, so you replace it in the equation, and u get:
pH + 11.24 = 14
Then, You move 11.24 to the other part. and moving from a part to another change the sign of the equation. And you get:
pH = 14 - 11.24 = 2.76
So, the pH of a solution that has a pOH of 11.24 is pH = 2.76
Hope this Helps :)
Answer:
Choice C - a mixture
Explanation: I just did the question
Below are the steps involved in synthesis of Lidocaine.
Answer:
Bismuth
Explanation:
In order to do this problem, we must use a periodic table. The molar mass is numerically equivalent to the atomic mass, which is provided for each element on the periodic table.
Xenon (Xe) has an atomic mass of 131.29 amu, or 131.29 g/mol.
Bismuth (Bi) has an atomic mass of 208.98 amu, or 208.98 g/mol.
Rhodium (Rh) has an atomic mass of 102.91 amu, or 102.91 g/mol.
Antimony (Sb) has an atomic mass of 121.76 amu, or 121.76 g/mol.
Thus, the answer is Bismuth because 208.98 is the largest.
Hope this helps!
