<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>
awnser : 6.02×1023 molcules
Answer:
Explanation:
M(s) → M (g ) + 20.1 kJ --- ( 1 )
X₂ ( g ) → 2X (g ) + 327.3 kJ ---- ( 2 )
M( s) + 2 X₂(g) → M X₄ (g ) - 98.7 kJ ----- ( 3 )
( 3 ) - 2 x ( 2 ) - ( 1 )
M( s) + 2 X₂(g) - 2 X₂ ( g ) - M(s) → M X₄ (g ) - 98.7 kJ - 2 [ 2X (g ) + 327.3 kJ ] - M (g ) - 20.1 kJ
0 = M X₄ (g ) - 4 X (g ) - M (g ) - 773.4 kJ
4 X (g ) + M (g ) = M X₄ (g ) - 773.4kJ
heat of formation of M X₄ (g ) is - 773.4 kJ
Bond energy of one M - X bond = 773.4 / 4 = 193.4 kJ / mole
Answer:
The Answer is 2-methylpentane
Or the third one down.
Explanation:
