What is the mass fraction of calcium in CaCO3?

Generally above 60%, there are many kinds of calcium carbonate, let's make it clear. Chinese name: calcium carbonate [English name] calcium carbonate [alias] carbonic acid calcium salt; limestone;Marble Calcium Carbonate [Common Names] Limestone, Calcite, Marble, Chalk, Aragonite, Stalactite, aragonite, White Marble [1] 【Product Name】 Calcium Carbonate 【Molecular Formula】 CACO 【Molecular Weight】 【Melting Point】825°C 【Main Ingredients】CAO,CO 【CAS Accession Number】 471-34-1 【EINECS】 207-439-9 【Density】 Molecular Formula M3 【Hardness】 Mohs Hardness3 【Decomposition Temperature】 898°C 【Melting Point】 When the pressure is , the melting point is 1339 °C 【Water solubility】 Almost insoluble in water dissolved in water containing ammonium salt or ferric oxide, insoluble in alcohol. 【Dielectric Constant】 【Safety Data】 Hazard Signs XI Hazard Code R36 38 【Safety Instructions】S26; S37 39 [Condition] White crystals or powder.

Tasteless. It is non-reactive in exposed air and insoluble in alcohol. 【Properties】In case of dilute acetic acid, dilute hydrochloric acid, and dilute nitric acid, it will boil and dissolve.

When heated to 900 kilopascals, it decomposes into calcium oxide and carbon dioxide. According to the different calcium carbonate production methods, calcium carbonate can be divided into heavy calcium carbonate, light calcium carbonate, colloidal calcium carbonate and crystalline calcium carbonate.

The mass fraction of an element in the compound = the mass of the compound The relative atomic mass of the element The number of atoms is early in the mu The relative molecular mass of the compound is 100%.

100 grams of CaCO3 calcium quality bending amount = 100g 40 100 100% = 40g

The proportion of calcium in the middle limb of caCO3 is 40 (40+12+16*3)=40%.

Therefore, the total mass of CaCO3 containing 30 grams of calcium trace elements is 30 40% = 75 grams.

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The mass fraction of CaCO3 in calcium tablets can be determined using the following protocol:1Take a certain quality of calcium tablets, called calcium tablets, put them into a beaker, and add a sufficient amount of hydrochloric acid (HCl) to dissolve them completely to produce CO2 gas.

3.Put the beaker on the electronic balance and weigh it, and the weight is to heat the beaker in a ventilated place to completely release the CO2 gas, and weigh the beaker on the electronic balance after cooling, and the weight is calculated as the mass fraction of CaCO3, the formula is: CaCO3 mass fraction = m2 - m3 - m4) m1 100%.

where m4 is the mass of the beaker. This method can quickly determine the mass fraction of CaCO3 in calcium tablets, which is of great help to the scientific interest group to understand the composition of calcium tablets.

18.+The main ingredient of a certain brand of calcium tablets is caco3, and a scientific interest group wants to determine the mass fraction of caco3 in calcium tablets,+

Dear, I'm glad to answer your <>

The mass fraction of CaCO3 in calcium tablets can be determined using the following protocol:1Take a certain mass of calcium tablets, called calcium tablets, put them into a beaker, and add a sufficient amount of hydrochloric acid (HCl) to completely dissolve the block, forming CO2 gas.

3.Put the beaker on the electronic balance and weigh it, the weight is to heat the beaker in a ventilated place so that the CO2 gas is completely released, and after the beaker is cooled, weigh it on the electric rental balance, and the weight is to calculate the mass fraction of CaCO3, the formula is: CaCO3 mass fraction = m2 - m3 - m4) m1 100%.

where m4 is the mass of the beaker. This method can quickly determine the mass fraction of CaCO3 in calcium tablets, which is of great help to the scientific interest group to understand the composition of calcium tablets.

1.Take a certain quality of calcium tablets, called chopping calcium tablets, put them in a beaker, add a sufficient amount of petroleum ether, and stir with a glass rod to completely dissolve the calcium tablets. 3.

Place the beaker in a ventilated place, wait for the petroleum ether to volatilize completely, put the beaker into the dryer, and dry it at 110 degrees to a constant weight (m2). 4.Place the beaker on an electronic balance and weigh it as Calculate the mass fraction of CaCO3 by the formula:

CaCO3 mass fraction = m3 - m2) m1 100%.

The mass fraction of CA in CASO3 is 1 3, CASO4 is 5 in Caso17Criss-cross 1 3 1 170 30%5 17 1 30 The mass brother ratio of caso3 and caso4 is 1 170:1 30=3:

The mass fraction of 17 caso4 is 17 (17+3)*100%=85%.

The mass fraction of caCO3 slipped.

It is: 40 + 12 + 16 * 3 = 100

The atomic mass of the Ca element accounts for the ratio of the bridge to the denier: 40 100 = 250 grams of CaCO3, of which the calcium element.

Mass: 250*

Categories: Education Science >> Admission >> Question Description:

What is the relative molecular weight of CaCl2 (calcium chloride)?

Analysis: Ca is 40, Cl is 35 5, only cl2 35 5 2 70 so it is 110

According to the chemical formula of calcium carbonate is CaCO3, it can be seen that calcium carbonate is composed of three elements: Ca, C and O.

According to the mass ratio of each element in the compound = the ratio of the relative atomic mass of each element and the number of atoms, the mass ratio of Ca, C and O elements in calcium carbonate can be obtained as: 40:12:(16 3)=10:3:12;

According to the relative molecular mass is the sum of the relative atomic masses of the atoms that make up the molecule, the relative molecular mass of calcium carbonate is: 40 + 12 + (16 3) = 100;

Mass fraction of calcium element in calcium carbonate = 40

So the answer is: three; 10：3：12； 100； 40%．

The relative molecular weight of CaO2 calcium oxide is 40+16*2 72

Mass fraction of calcium in CaO2 40 72 *100%=

The relative molecular weight of CaO2 calcium oxide is 72g mol, and the mass fraction of calcium in CaO2 is 40 72 = 5 9