The formula of determining the molarity is:
molarity = -(1)
Volume of solution = (given)
Since, 1 mL = 0.001 L
Therefore, volume of the solution = 0.22 L
Molarity = 0.194 M (given)
Substituting the values in formula (1)
Now, number of moles = -(2)
Molar mass of =
Substituting the value of number of moles and molar mass of in equation -(2)
Hence, the mass in grams of potassium permanganate the chemist has added to the flask is .
3.3 moles of sulfur
Explanation:
To find the number of moles knowing the number of atoms we use Avogadro's number to formulate the following reasoning:
if in 1 mole of sulfur (S) there are 6.022 × 10²³ atoms of sulfur (S)
then in X moles of sulfur (S) there are 2 × 10²⁴ atoms of sulfur (S)
X = (1 × 2 × 10²⁴) / (6.022 × 10²³)
X = 3.3 moles of sulfur
Learn more about:
Avogadro's number
brainly.com/question/1445383
#learnwithBrainly
Answer:
2.209g/mL
Explanation:
The density of a substance is defined as the ratio between its mass (Generally in grams) and its volume (Generally in mililiters).
The volume dispensed in a buret is: Final volume - Initial volume. In the problem:
45.91mL - 35.00mL = <em>10.91mL</em>
As the mass of solution dispensed is <em>24.10g</em>, density is:
24.10g / 10.91mL = <em>2.209g/mL</em>
I hope it helps!
Answer:
The volume of corn syrup is 41.5 mL.
Explanation:
Mass of the corn syrup ,m= 57.3 g
Volume of the corn syrup = V
Density of the corn syrup = d = 1.38 g/mL
The volume of corn syrup is 41.5 ml.
A reaction in which Oxygen (O₂) is produced from Mercury Oxide (HgO) would be a decomposition reaction.
2HgO → 2Hg + O₂
If 250g of O₂ is needed to be produced,
then the moles of oxygen needed to be produced = 250g ÷ 32 g/mol
= 7.8125 mol
Now, the mole ratio of Oxygen to Mercury Oxide is 1 : 2
∴ if the moles of oxygen = 7.8125 mol
then the moles of mercury oxide = 7.8125 mol × 2
= 15.625 mol
Thus the number moles of HgO needed to produce 250.0 g of O₂ is 15.625 mol