Question

Срочно, помогите! 1) Рассчитайте массу алкоголята калия, который образуется при взаимодействии 5,85 г калия с пропанолом массой 7,2 г 2)При взаимодействии пропанола с избытком металлического катрия выделяется водород, занимающий при нормальных условиях обьем 14 л.Вычислите массу пропанола, вступившего в реакцию

Answer 1

2C3H7OH+2K=2C3H7OK+H2
Определим что в недостатки ,по нему будим вести расчет
nC3H7OH=7,2/Mr(36+7+17=60)=0,12 моль
nK=5,85/39=0,15 моль
0,12<0,15
nC3H7OK=nC3H7OH=0,12 моль
m---------=0,12*Mr(36+7+16+39=98)=11,76г
2)
2С3Н7ОН+2Na=2C3H7ONa+H2
nH=14/22,4=0,625 моль
nC3H7OH=1/2nH=0,625/2=0,313 моль
mс3Н7ОН=0,313*60=18,75г

Answer 2

Calculation of the Mass of Potassium Alkoxide

To calculate the mass of potassium alkoxide formed when 5.85 g of potassium reacts with 7.2 g of propanol, we need to determine the stoichiometry of the reaction and use it to calculate the amount of potassium alkoxide produced.

The balanced chemical equation for the reaction between potassium and propanol is:

2 K + 2 C3H7OH -> 2 C3H7OK + H2

From the balanced equation, we can see that 2 moles of potassium react with 2 moles of propanol to produce 2 moles of potassium alkoxide. This means that the mole ratio between potassium and potassium alkoxide is 1:1.

To calculate the mass of potassium alkoxide, we can use the following steps:

1. Calculate the number of moles of potassium: - Moles of potassium = mass of potassium / molar mass of potassium - Moles of potassium = 5.85 g / 39.1 g/mol (molar mass of potassium) = 0.149 moles

2. Since the mole ratio between potassium and potassium alkoxide is 1:1, the number of moles of potassium alkoxide formed is also 0.149 moles.

3. Calculate the mass of potassium alkoxide: - Mass of potassium alkoxide = moles of potassium alkoxide * molar mass of potassium alkoxide - The molar mass of potassium alkoxide depends on the specific alkoxide formed. Without additional information, we cannot determine the exact molar mass of the alkoxide.

Therefore, we can calculate the number of moles of potassium alkoxide formed but cannot determine the exact mass without knowing the molar mass of the specific alkoxide.