Chemistry is a question of quality. Seek quality in chemistry

The characteristic of this problem is that it does not need to be calculated step by step, but directly based on the conservation of elements.

Analysis: Na2CO3, H2O, NaHCO3 are a total of MG--- plus HCl, it is obvious that HCl is excessive, so the obtained solution is a mixed solution of NaCl and HCl.

- Add NaOH to neutralize, that is, the excess HCl reaction, and only NaCl solution is obtained.

- Evaporation yields NaCl

The Na** in the NaCl has 2, 1 is Na2CO3 and NaHCO3 in the original solid, and 2 is the neutralization of NaOH added by HCL.

However, CL can only come from HCL

i.e., HCl---NACL

i.e., n(NaCl)=n(HCl)=

m(nacl)=

From the inscription, it can be seen that the last remaining solid is NaCl, so n=40 1000*2=

m=（。08=

It must be troublesome to calculate step by step, but it is different when using the conservation of elements. The last thing left is sodium chloride, chloride ions come from hydrochloric acid, the only conserved substance, knowing the amount of hydrochloric acid knows the amount of sodium chloride. Give me extra points!

Summary. Please provide a chemical formula, e.g. C6H12O6, in order to calculate the mass of one of the substances.

Knowing the mass of a substance in a chemical formula, find one of them.

Please provide a chemical formula, e.g. C6H12O6, in order to calculate the mass of one of the substances.

1) The mass of the generated Na2CO3 is; (2) The volume of O2 generated under the standard condition is .

According to the chemical formula you provide, the steps and process are as follows:1Mix Na2O2 and sufficient amounts of CO2 under laboratory conditions.

2.The mixture is heated, Na2O2 and CO2 undergo a chemical reaction to generate Na2CO3 and collect the generated Na2CO3, weigh the mass of the substance with a weighing flask, and find the mass rent of Na2CO3. 4.

Use a collector or graduated cylinder to collect the generated gas oak body to find the volume of O2.

Can you please write down the detailed process of these questions?

It can only help you write one question.

<>Okay. Thank you anyway.

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Summary. Hello, quality is denoted by m. The most commonly used units are g (grams), but there are also mg (milligrams) and kg (kilograms).

The formula for calculating the mass is as follows:

m=v (volume multiplied by density).

m = n m (the amount of the substance multiplied by the molar mass).

Then the amount of a substance can be obtained by the molar volume of the gas and the concentration of the substance, and then substituted into the above formula.

Seek quality in chemistry

Hello, quality is denoted by m. The most commonly used units are g (grams), but there are also mg (milligrams) and kg (bidong kilograms).The formula for calculating the mass is as follows:

m=v (volume multiplied by density) m=n m (amount of substance multiplied by molar mass) and then the amount of substance can be obtained by the molar volume of the gas and the amount and concentration of the substance, and then substitute it into the above formula.

These two molar quality ** check.

Ask for it. Does one mole mean that it contains a molecule of the substance? Well.

May I ask you are a student of that level, if you are in high school, you can use the amount of matter to be conserved, 20g

CaCO3 i.e., according to the conservation of Ca, M(CaCl2) = can be obtained immediately, the mass of potassium carbonate and the potassium chloride generated later can be obtained by calcium chloride (write the chemical equation), and then the mass of the original KCl can be obtained by subtracting the mass of calcium chloride from the total mass, and the potassium chloride generated later can be solved by adding the potassium chloride generated later with the original potassium chloride.

m = PV (p is the density, v is the volume of matter) m = e c 2 (c is the speed of light, e is energy.

This is Einstein's mass-energy equation) m = m n (m is the molar mass of the substance, n is the amount of the substance of the substance) sliding friction f = f m m = f f (f is the positive pressure, f is the sliding friction) m = f a (f is the resultant force received, a is the acceleration of the object) m = m (dissolved) w (w is the mass fraction of the substance in solution).

m=ρv

Density multiplied by mass.

m = n m (the amount of the substance multiplied by the molar mass).

m=g g gravity on g

m = f a acceleration on the resultant force ratio.

n: The amount of matter.

n=n/na

The ratio of the number of particles contained in the substance (n) to the Avogadro constant (na).

Under the condition of no gravity, the spring tension force meter is used to pull the ball with the force of f, and the acceleration is measured as a, and the mass of the ball is f a

1.Use a tool to weigh mass: balances.

2.It can be obtained from g = mg: m = g g

3.Use the formula: m=p*

v obtained.

(1) Mass of a substance = volume * density.

2) Mass of solute = mass fraction of solution * mass of solution (3) Mass of substance = amount of substance * molar mass.

4) Mass of the substance = Mass concentration of the substance * molar mass * Mass of the solution 1000 * Density (5) Mass of the substance = Total number of particles * Molar mass of the substance * Avergadro's constant (6) At a certain pressure and temperature: mass of the substance = pressure * volume number * molar mass r * temperature (r is constant, temperature is Kelvin).

7) In standard conditions, the mass of the gas = the volume of the gas * the molar mass of the gas * liters.

What to find the mass, to be specific, there are many physical methods, simple weighing, bulk density.

caco3+2hcl==cacl2+h2o+co2↑x

100/x=44/

x=15g1) The mass of calcium in each tablet is 15g 10=2) The mass of each tablet containing calcium in the liter source is.

1) The quality of each tablet containing c is:

So the mass containing calcium carbonate is:

2) The mass of each tablet containing calcium is:

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Let the mass collision of calcium carbonate be x

caco3+2hcl=cacl2+co2

100/x=44/

x = 600mg of calcium