Question

I).Расставить коэффициенты в уравнениях реакций: 1). K+O2=K2O 2). K2CO3+HCl=KCl2+H2O3). Zn+CuCl2=ZnCl2+Cu 4). CuOH=Cu2O+H2OII). Найти массу соли, которая образуется при действии 14.6 раствора соляной кислоты на аарбонат калия.

Answer 1

4K+O2=2K2O
K2CO3+2HCl=2KCl+H2O+CO2
Zn+CuCl2=ZnCl2+Cu
2CuOH=Cu2O+H2O

2HCl+K2CO3=2KCl+H2O+CO2
n(HCl)=14,6/36,5=0,4 моль
n(HCL)=n(K2CO3)
m(K2CO3)=0,4*138=55,2 г  

Answer 2

I) Let's balance the chemical equations first:

1) K + O2 = K2O - The balanced equation is: 4K + O2 = 2K2O [[1]]

2) K2CO3 + HCl = KCl2 + H2O - The balanced equation is: K2CO3 + 2HCl = 2KCl + H2O + CO2 [[2]]

3) Zn + CuCl2 = ZnCl2 + Cu - The balanced equation is: Zn + CuCl2 = ZnCl2 + Cu [[3]]

4) CuOH = Cu2O + H2O - The balanced equation is: 2CuOH = Cu2O + H2O [[4]]

II) To find the mass of the salt formed when a 14.6% solution of hydrochloric acid reacts with potassium carbonate, we need to calculate the number of moles of the reactants and use stoichiometry to determine the mass of the product.

The equation for the reaction is: K2CO3 + 2HCl = 2KCl + H2O + CO2

1) Calculate the number of moles of HCl: - The concentration of the HCl solution is 14.6%, which means there are 14.6 grams of HCl in 100 grams of the solution. - We can calculate the number of moles of HCl using its molar mass, which is 36.46 g/mol. - Moles of HCl = (14.6 g / 36.46 g/mol) = 0.4 mol [[5]]

2) According to the balanced equation, the stoichiometric ratio between HCl and K2CO3 is 2:1. - This means that for every 2 moles of HCl, we need 1 mole of K2CO3.

3) Calculate the number of moles of K2CO3: - Since the stoichiometric ratio is 2:1, the number of moles of K2CO3 is half the number of moles of HCl. - Moles of K2CO3 = (0.4 mol / 2) = 0.2 mol

4) Calculate the mass of K2CO3: - The molar mass of K2CO3 is 138.21 g/mol. - Mass of K2CO3 = (0.2 mol * 138.21 g/mol) = 27.64 g

Therefore, the mass of the salt (KCl) formed when 14.6 grams of hydrochloric acid reacts with potassium carbonate is approximately 27.64 grams.

Please note that the calculations provided are based on the given information and assumptions.