Answer:
pH= 3.82
Explanation:
Sodium ethanoate or sodium acetate (CH3COONa) ionises completely.
Ethanoic acid or acetic acid (CH3COOH), ionises partially because it is a weak acid.
3 O2 + CS2 = CO2 + 2 SO2
That is the balanced equation!
I may be late lol!!
Hope it helps
Answer:
Iron ore, coke and lime stone are some raw materials used for extracting iron.
Hope it helps! :)
Answer:
9.0 g
Explanation:
There is some info missing. I think this is the original question.
<em>A chemist must prepare 0.9 L of sodium hydroxide solution with a pH of 13.40 at 25°C. He will do this in three steps: Fill a volumetric flask about halfway with distilled water. Weigh out a small amount of solid sodium hydroxide and add it to the flask. Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits.</em>
<em />
Step 1: Calculate the pOH
We use the following expression.
pH + pOH = 14.00
pOH = 14.00 - pH = 14.00 - 13.40 = 0.60
Step 2: Calculate [OH⁻]
We use the following expression.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH = antilog -0.60 = 0.25 M
Step 3: Calculate [NaOH]
NaOH is a strong base that releases 1 OH⁻. Then, [NaOH] = 0.25 M
Step 4: Calculate the mass of NaOH
The molar mass of NaOH is 40.00 g/mol. The mass required to prepare 0.9 L of a 0.25 M solution is:
Answer:
see below
Explanation:
1. 1 mol Mg = 24.31 g = 6.02 *10^23 atoms
calculate the number of atomsin 80.45g Mg
Numberof atoms = 6.02*10^23 Mg atoms / 24.31 g * 80.45 g
= 1.99*10^24 atoms
2.1 mol C-12 = 12.01g = 6.02 * 10^23 atoms
calculate the mass using
= 12.01 g C / 6.02*10^23 atoms * 100 atoms
= 1.99 * 10^-21 g