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A sample of zinc metal reacts completely with an excess of hydrochloric acid:$$\mathrm{Zn}(s)+2 \mathrm{HCl}(a q) \longrightarrow \mathrm{ZnCl}_{2}(a q)+\mathrm{H}_{2}(g)$$The hydrogen gas produced is collected over water at $25.0^{\circ} \mathrm{C}$ using an arrangement similar to that shown in Figure $5.15 .$ The volume of the gas is $7.80 \mathrm{L}$, and the pressure is 0.980 atm. Calculate the amount of zinc metal in grams consumed in the reaction. (Vapor pressure of water at $\left.25^{\circ} \mathrm{C}=23.8 \mathrm{mmHg} .\right)$

$$19.8 \mathrm{g} \mathrm{Zn}$$

Chemistry 101

Chapter 5

Gases

Carleton College

University of Central Florida

Drexel University

Lectures

05:03

In physics, a gas is one of the three major states of matter (the others being liquid and solid). A gas is a fluid that does not support tensile stress, meaning that it is compressible. The word gas is a neologism first used by the early 17th-century Flemish chemist J.B. van Helmont, based on the Greek word ("chaos"), the simplest of all the elemental forms of matter.

04:46

In physics, thermodynamics is the science of energy and its transformations. The three laws of thermodynamics state that energy can be exchanged between physical systems as heat and work; that the total energy of a system can be calculated by adding up all forms of energy in the system; that energy spontaneously flows from being localized to becoming dispersed, spread out, or uniform; and that the entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

05:35

A sample of zinc metal rea…

02:06

02:00

04:02

A sample of zinc metal was…

04:37

04:04

The reaction between zinc …

04:05

Small quantities of hydrog…

for this question is seeing really had record exit and a forum sink chloride and hydrogen gas. And the information provided is the volume temperature and the pressure. So first thing, we have to find out the pressure off hydrogen gas. This press trigger is the total pressure off hydrogen gas and water. So we have to find out the partial pressure for hiring guests. So which is 0.90 equals two parcel plus 23.8 as the pressure for water. Which means that the presser the partial pressure of hydrogen is equals two. Oh, I forget to convert this s d mm Mercury, you have to convert that into a T. M first. So after you do the conversion, you should get 0.313 What is your role? One flea. Okay, so it would be these numbers of transferred by this number. So 0.980 minus 0.313 So usually cap zero point ny for a seven. Issa partial pressure for this one. Now you will use the ideal gas law PV eco's to an rt to find out the number off more off hydrogen Okay, So the pressure would be this zero point night floor 87 and, ah, multiply by the volume, which is 7.8 and then it's equals to the number off. More times, constant times a temperature. So you will find a number of Morris equals 20.30 more. And you know that the mole ratio off her origin gas to dizzying it's one to work so number off, more dizzying were also equals Teoh 0.3 more. And then, in order to find out the massive saying you have to use this one, you're not number off more as equals two mass over molar mass. Which means that mast as equals two number off more times molar mass. So I just write in this way so mass would be equals. 2.3 multiply by what is the molar mass? The moulder mass would be 65 14 so the mass to find a mass isn equals to 19.8 gram

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