The answer is 2) 4.7 g/mL because the solid use 17 mL and 80g/17mL is 4,7 g/mL.
Answer: A solution forms when the attractive _forces_ between the solute and solvent are _similar/higher_ in strength to the solvent-solvent and solute-solute attractions and are therefore able to replace them.
Explanation: Intermolecular forces between solute and solvent must be able to match or exceed the natural intramolecular forces between the solvent-solvent atoms/molecules and solute-solute atoms/molecules.
This is where the solubility law of 'like dissolves like (polar dissolves polar and likewise)' comes into play. Only polar compounds can form such attractive forces with fellow polar compounds and the same story goes for non-polar compounds.
Answer:
High levels of nitrogen dioxide are also harmful to vegetation—damaging foliage, decreasing growth or reducing crop yields. Nitrogen dioxide can fade and discolour furnishings and fabrics, reduce visibility, and react with surfaces.
1-We could use low-nitrogen fuels
2- We could also modify combustion conditions to generate less NOx. Flue gas treatment techniques, such as selective cata- lytic reduction (SCR) processes, can remove NOx
<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
Answer:
3.74%
Explanation:
We express a solution's volume by volume percent concentration, % v/v,
Take the ratio of the isopropyl alcohol (IPA) volume to the total volume of the solution, which is 1800 mL of water+ 70 mL of IPA,
and multiply by 100 to get the percentage: 70/(1800+70) *100 = 0.0374*100 = 3.74%
