would you select water or gasoline to try dissolving the following : table sugar, motor oil, rubber from tire marks, adhesive re
2 answers:
You might be interested in
Answer:
0,31%
Explanation:
For the reaction:
I₂ + 2 S₂O₃²⁻ → 2 I⁻ + S₄O₆²⁻
0,043 L × 0,117 M of sodium tiosulfate = 5,031x10⁻³ moles of S₂O₃²⁻
5,031x10⁻³ moles of S₂O₃²⁻ × = <em>2,5156x10⁻³ moles of I₂</em>
These moles of I₂ were produced from:
ClO⁻⁻ + 2 H⁺ + 2 I⁻ → I₂ + Cl⁻ + H2O
2,5156x10⁻³ moles of I₂ ≡ moles of NaClO
2,5156x10⁻³ moles of NaClO × =<em> 0,187 g of NaClO</em>
Thus, percentage composition by mass is:
=<em> 0,31%</em>
I hope it helps!
<u>Answer:</u> The number of atoms in spherical gold nano particle are
<u>Explanation:</u>
- To calculate the volume of sphere, we use the equation:
where,
r = radius of the sphere = (Conversion factor:
)
Putting values in above equation, we get:
- To calculate mass of of the substance, we use the equation:
Volume of gold =
Density of gold =
Putting values in above equation, we get:
- To calculate the number of moles, we use the equation:
Mass of gold =
Molar mass of gold = 196.97 g/mol
Putting values in above equation, we get:
- According to mole concept:
1 mole of an element contains number of atom
So, moles of gold will contain =
number of atoms.
Hence, the number of atoms in spherical gold nano particle are