& lt 1 & gt； Copper carbonate: 1. The atomic number ratio is 2. Relative molecular mass (Mr) 3. The element mass ratio is 4. Copper% carbon%</p><p>& lt 1 & gt； Solution: 1, the atomic ratio of copper,

& lt 1 & gt； Copper carbonate: 1. The atomic number ratio is 2. Relative molecular mass (Mr) 3. The element mass ratio is 4. Copper% carbon%

& lt 1 & gt； Solution: 1, the atomic ratio of copper,

& lt 1 & gt； Copper carbonate: 1. The atomic number ratio is 2. Relative molecular mass (Mr) 3. The element mass ratio is 4. Copper% carbon%

& lt 1 & gt； Solution: 1, the atomic ratio of copper, carbon, hydrogen and oxygen in basic copper carbonate [Cu2(OH)2CO3] = 2: 1: 2: 5.

2. The relative molecular weight (MR) of Cu2 (OH) 2co3 is 64 * 2+(16+1) * 2+12+16 * 3 = 222.

3. The mass ratio of copper, carbon, hydrogen and oxygen in Cu2 (OH) 2CO3 is 64 * 2:12:1* 2:16 * 5 = 64: 6:1:40.

4. The mass fraction of copper in Cu2 (OH) 2co3 =64*2/222* 100%=57.7%.

The mass fraction of carbon in Cu2(OH)2CO3 =12/222 *100% = 5.4%.

& lt2> solution: let the mass of CuCl2 be x.

According to the conservation of copper atom, the following relation is obtained:

2CuCl2 - 2Cu - Cu2(OH)2CO3

270 222

X100g

X= 12 1.6g