1 10 grams of metal and acid solution to produce 4L of hydrogen, find the molar mass and equivalent

Question 1 56 grams per mole, is iron, process 10*

Question 2 This question is wrong, there is too much mass of metal oxides, too little water, and it can only be regarded as hydrogen. Besides, how does hydrogen oxidize an oxide?

Question 3 Is there an isotope, the hydrogen is mixed with deuterium one-to-one, what is the equivalent of molar mass, I have only heard of bomb yield.

The three questions are only given 5 points, and the scores are too small, and they will not be answered. Unless extra points.

The ratio of the amount of the substance obtained by the cross pin method.

The mass ratio of Fe and Mg is 16:16=1:1, and the mass ratio is 56:24=7:3

The number of atoms is less than 1:1

It is calculated that Fe and Mg are both, 3, and a piece of alloy with a mass of 4 grams reacts with a sufficient amount of hydrochloric acid to produce grams of hydrochloric gas. If the alloy consists of Fe, Mg

A piece of alloy with a mass of 4 grams reacts with a sufficient amount of hydrochloric acid to produce grams of hydrogen gas. If the alloy is composed of Fe and Mg, then its mass ratio may be how many atoms are in ratio.

I use the cross method to calculate the mass ratio of the lead bucket to 1: and then use n1 n2=m2 m1 to get the atomic number ratio of 3: but I directly use the cross to find the atomic number ratio how to get 7:

First, the metal reacts with hydrochloric acid to form hydrogen and metal salts, i.e.: M + NHCl -> MCL + N 2H2.

It is known that the volume of hydrogen gas that is generated and destroyed is that according to the ideal gas law, the amount of substances that produce hydrogen can be calculated:

PV = NRT, where P is the pressure of the gas, V is the volume, N is the amount of matter, R is the gas constant, and T is the absolute temperature.

Under standard conditions, p=1atm, t=273k, r=.

Therefore: n = pv rt

1atm * / * 273k)

According to the reaction equation, the amount of metal substances required to generate 1 mol of hydrogen is 1 mol, so the amount of metal substances required to produce hydrogen is a cover.

Valency of metals:

Valency = The amount of the substance and the mass of the metal.

The quality of the metal.

Because the mass of the metal is not given, the valency of the metal cannot be calculated.

The amount of hydrogen substance is pure l=

Let the metal valency be +x, and use r to represent the code infiltration of this metal, then the equation is.

r+xhcl==rclx+x/2h2

1mol x/2 mol

Column proportional, the solution is x=3. That is, the metal valency is +3

The meaning of the title is that the gas is a mixture of water vapor and hydrogen, so first find out the amount of the substance n of the mixed gas from pv=nrt is the total is, 18 when the saturated vapor of water is, and the amount of water vapor obtained by pv=nrt is, so the amount of hydrogen is , because the question says that the amount of metal and hydrogen substances is equal, so the amount of metal matter is, and m=m n is obtained by m=m, that is, the relative atomic mass of the metal is.

(1) Let the molar mass of the metal be m, and according to the conservation of electron transfer, then:

m×1=2g/mol

2. The solution is m=39g mol, so the answer is: 39g mol;

2) Solution: Under the standard condition, the amount of the substance of V l gas = vl =

mol, whose mass = v

mol g, solvent mass 100g, so the volume of the solution = 100g + g1000 g l

l, so the amount of substance concentration of the resulting solution = v

mol2240+

22400ρl

1000ρv

mol l, so the answer is: 1000 V

mol/l．

According to the reaction with sulfuric acid, iron, zinc, magnesium, aluminum, sodium are +2, +2, +2, +3, +1 valence, respectively, and hydrogen is generated after the reaction with sufficient dilute sulfuric acid, and the mass of the metal required to be consumed is:

The quality of metallic iron is required =

2=；The quality of metallic zinc is required.

2=13g；The quality of magnesium metal is required =

2=；The quality of metal aluminum is required =

3=；The mass of sodium metal is required =

1=, copper does not react with dilute sulfuric acid; According to the mass of the gas produced by the reaction of the metal mixture with the acid is the mass of hydrogen produced by the reaction of the two metals, and the hydrogen gas is generated after the reaction of the two metal mixtures with a sufficient amount of dilute sulfuric acid in the actual experiment, it can be judged that the two metals in the option mixture may only be a mixture of metal copper and aluminum or a mixture of magnesium and zinc;

So choose CD

Let the alloy be a metal r, assuming a +2 valence, and let the relative atomic mass of the metal be x, then:

r+2hcl═rcl2h2x 2

4G according to: x

Solution x=40

a. The relative atomic mass of Fe is 56, and the relative atomic mass of Mg is 24, so A is correct;

The relative atomic mass of b and Fe is 56, and the relative atomic mass of Al is 27, so B is correct;

The relative atomic mass of C, Fe is 56, and the relative atomic mass of Zn is 65, so C is wrong;

The relative atomic mass of D and Mg is 24, and the relative atomic mass of Al is 27

g h2 is moles.

Molar metal generates molar H2

1 mole of metal to form molar h2 i.e. transfer 3 mole electrons, so the metal is +3

Molar trivalent metal transfer molar electrons i.e. consuming molar H+ molar acid contains molar H+ then the acid is a dibasic acid.

, indicating that there is hydrogen, that is, the hydrogen atom, and acid has, so the acid is a dibasic acid, and the common dibasic acid is sulfuric acid.

The metal produces hydrogen (electron transfer), so the metal is trivalent and the common trivalent metal is aluminum.

The first thing to determine is a few acids: hydrogen is hydrogen ions.

The amount of acid is 2mol l*

Therefore, it is a dibasic acid, which is preliminarily determined to be sulfuric acid.

The number of transferred electrons is metal, so the valency of the metal after the reaction is +3 and should be al