NH3 is a molecule with a nitrogen atom in the middle surrounded by 3 hydrogen atoms bonded covalently. Nitrogen has 5 valence electrons so, it will form sigma bonds (sp3 hybrid orbitals) with each of the hydrogen atom. The remaining lone pair electrons will be situated above the atom. You ca look at this image I've pulled from Google.
<span>23.8 g/mol
Since the definition of molar mass is mass per mole, just divide the mass of the sample by the number of moles you have. So
0.250 g / 1.05x10^-2 mol = 23.8095 g/mol
Since our input data only has 3 significant figures, you need to round the result to 3 significant figures.
23.8095 g/mol rounds to 23.8 g/mol</span>
Answer:
The claim is incorrect because the exact position of matter is always visible or can be determined.
2.94
×
10
24
⋅
molecules
6.022
×
10
23
⋅
molecules
⋅
mol
−
1
×
142.3
⋅
g
⋅
mol
−
1
≅
700
⋅
g