Question

Двухвалентный металл массой 3 г полностью прореагировал с раствором хлоридной кислоты.Выделился газ объёмом 2,8 л (н.у.).Высчитайте ,какой металл вступил в реакцию.Укажите тип химической связи в веществе,которое осталось в растворе.Решите,пожалуйста,ПОЛНОСТЬЮ!

Answer 1

Me+2HCl--->MeCl2+H2
по задаче нам можно узнать количество водорода
n(H2)=2,8/22,4=0,125 моль
n(H2)=n(Me)=0,125 моль
мы можем узнать молярную массу вещества надо 3/0,125=24г/моль т.е. этот металл Mg
связь в MgCl2 ионная

Answer 2

Problem Analysis

We are given that a 3 g sample of a divalent metal reacts completely with a solution of hydrochloric acid, producing 2.8 L of gas at standard conditions. We need to determine the identity of the metal and the type of chemical bond in the remaining substance.

Solution

To solve this problem, we need to use the concept of stoichiometry and the ideal gas law.

1. Calculate the number of moles of gas produced: - We know that the volume of gas produced is 2.8 L at standard conditions (n.у.). - According to the ideal gas law, the number of moles of gas can be calculated using the equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. - At standard conditions, the pressure (P) is 1 atm, the volume (V) is 2.8 L, and the temperature (T) is 273.15 K. - The ideal gas constant (R) is 0.0821 L·atm/(mol·K). - Rearranging the equation, we can solve for the number of moles (n): n = PV / RT. - Substituting the values, we get: n = (1 atm) * (2.8 L) / (0.0821 L·atm/(mol·K)) * (273.15 K). - Calculating this expression gives us the number of moles of gas produced.

2. Determine the molar mass of the metal: - We are given that the mass of the metal is 3 g. - The molar mass of an element is the mass of one mole of that element. - To calculate the molar mass of the metal, we need to divide the mass of the metal by the number of moles of the metal. - This will give us the molar mass of the metal.

3. Identify the metal: - To determine the identity of the metal, we need to compare its molar mass to the molar masses of different elements. - We can use the periodic table to find elements with molar masses close to the calculated molar mass of the metal. - The element with a molar mass closest to the calculated molar mass is likely the metal that reacted with hydrochloric acid.

4. Determine the type of chemical bond in the remaining substance: - The remaining substance is the substance that did not react with the metal. - To determine the type of chemical bond in the remaining substance, we need to know its chemical formula. - Without additional information, it is not possible to determine the type of chemical bond in the remaining substance.

Answer

To fully solve the problem, we need additional information to determine the type of chemical bond in the remaining substance. However, we can calculate the number of moles of gas produced and determine the molar mass of the metal using the given information.

Please provide the molar mass of the metal and any additional information about the remaining substance to further assist you.