Question

Сколько теплоты необходимо затратить на разложение 500 г оксида ртути ( || ) , если термохимическое уравнение имеет вид 2HgO = 2Hg + O2 - 180 кДж. Пожалуйста подробно

Answer 1

М(HgO)=217г/ моль
n(HgO)=500/217≈2,3моль
Пропорция
при разложении 2 моль оксида ртути поглощается 180 кДж теплоты
при разложение 2,3 моль поглощается х кДж
х=2,3*180/2=207кДж
Ответ: необходимо затратить 207 кДж теплоты

Answer 2

M(HgO)=217 г/моль; n(HgO)=m/M=500/217=2,3 моль;
По уравнению реакции на 2 моль HgO затратили 180 кДж. Найдём, сколько затратят на 2,3 моль HgO.
Пропорция: 
2 моль HgO ------ 180 кДж, 2,3 моль HgO ------- X. Отсюда X (т.е. Q)= 2,3*180 / 2=207 кДж.

Answer 3

Calculating the Heat Required to Decompose 500g of Mercury(II) Oxide (HgO)

To calculate the heat required to decompose 500g of mercury(II) oxide (HgO), we can use the given thermochemical equation and the molar mass of HgO to determine the amount of heat released or absorbed during the reaction.

The given thermochemical equation is: 2HgO → 2Hg + O2 ΔH = -180 kJ

First, we need to find the molar mass of HgO to proceed with the calculation.

The molar mass of HgO can be calculated as follows: - Molar mass of Hg = 200.59 g/mol - Molar mass of O = 16.00 g/mol - Molar mass of HgO = 200.59 g/mol + 16.00 g/mol = 216.59 g/mol

Now that we have the molar mass of HgO, we can proceed with the calculation.

Calculation Steps:

1. Calculate the moles of HgO in 500g: - Moles of HgO = Mass / Molar mass = 500g / 216.59 g/mol

2. Use the stoichiometry of the reaction to relate the moles of HgO to the heat released: - Given: 2 moles of HgO → -180 kJ - 1 mole of HgO → -180 kJ / 2 moles = -90 kJ

3. Calculate the heat required for 500g of HgO: - Heat required = Moles of HgO × Heat per mole = (500g / 216.59 g/mol) × -90 kJ/mol

Let's calculate the heat required for the decomposition of 500g of HgO using the given thermochemical equation and the molar mass of HgO.

Calculation:

- Moles of HgO = 500g / 216.59 g/mol = 2.309 moles - Heat required = 2.309 moles × -90 kJ/mol = -207.81 kJ

The heat required to decompose 500g of mercury(II) oxide (HgO) is approximately 207.81 kJ. [[1]]