Question

Пластинку из железа массой 10,4 г опустили в раствор хлорида меди(II). Через некоторое время пластинку вынули, высушили и взвесили. Ее масса оказалась равной 10г. Вычислите массу железа, перешедшего через раствор, и массу меди, осевшей на пластинке

Answer 1

Молярная масса меди 64 г, молярная масса железа 56 г. 

Кол-во меди= кол-ву железа 

Пусть х — количество железа, перешедшего в раствор

10 - 56x +64x=10,4

8x= 0,4 

x= 0.05

m(Fe)=56* 0.05 = 2.8г железа перешло в раствор

m(Cu)=64* 0,05 = 3,2 г меди осело на пластинке

Ответ:m(Cu)=64* 0,05 = 3,2 г меди осело на пластинке ; m(Fe)=56* 0.05 = 2.8г железа перешло в раствор

 

Answer 2

Problem Analysis

We are given a situation where a 10.4 g iron plate is immersed in a solution of copper chloride (CuCl2). After some time, the plate is removed, dried, and weighed, and its mass is found to be 10 g. We need to calculate the mass of iron that transferred into the solution and the mass of copper that settled on the plate.

Solution

To solve this problem, we need to consider the conservation of mass. The total mass of the system (iron plate + copper chloride solution) before and after the reaction should be the same.

Let's assume that the mass of iron transferred into the solution is x grams, and the mass of copper settled on the plate is y grams.

According to the conservation of mass, we can write the following equation:

Initial mass of iron plate = Final mass of iron plate + Mass of iron transferred into the solution

10.4 g = 10 g + x g

Simplifying the equation, we find:

x = 10.4 g - 10 g = 0.4 g

Therefore, the mass of iron that transferred into the solution is 0.4 g.

To find the mass of copper settled on the plate, we can subtract the mass of iron transferred from the initial mass of the iron plate:

y = Initial mass of iron plate - Mass of iron transferred into the solution

y = 10.4 g - 0.4 g = 10 g

Therefore, the mass of copper settled on the plate is 10 g.

Answer

The mass of iron that transferred into the solution is 0.4 g, and the mass of copper that settled on the plate is 10 g.