Ile gramów metyloaminy można zobojętnić, używając 200 cm³ roztworu kwasu solnego o stężeniu 1 mol/dm³ ?
Z def. stęż. molowego
1mol HCl----1000cm3
xmoli HCl------200cm3
x = 0,2mola HCl
M HCl=36,5g/mol
36,5g HCl-----1mol
xg HCl----------0,2mola
x = 7,3g HCl
mCH3-NH2=31u
CH3-NH2 + HCl----->CH3-NH3⁺Cl⁻
31g CH3-NH2--------36,5g HCl
xg CH3-NH2------------7,3g HCl
x = 14,2g CH3-NH2
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Z def. stęż. molowego
1mol HCl----1000cm3
xmoli HCl------200cm3
x = 0,2mola HCl
M HCl=36,5g/mol
36,5g HCl-----1mol
xg HCl----------0,2mola
x = 7,3g HCl
mCH3-NH2=31u
CH3-NH2 + HCl----->CH3-NH3⁺Cl⁻
31g CH3-NH2--------36,5g HCl
xg CH3-NH2------------7,3g HCl
x = 14,2g CH3-NH2