Me will give brainliest to first correct ! : )

1. how many molecules are present in 3 moles of silicon dioxide (sio2)
a. 5.00 x 10^23
b. 6.02 x 10^23
c. 12.36 x 10^23
d. 18.06 x 10^23

2. what is the molar mass of ag2s?

3. in the balanced equation 4ko + 2co2 = 2k2co3 +co3 which two chemicals have a molar ratio of 3: 4?

Explanation:

1. How many molecules are present in 3 moles of silicon dioxide (sio2)

A. 5.00 x 10^23

B. 6.02 x 10^23

C. 12.36 x 10^23

D. 18.06 x 10^23

18.066  × 10²³atoms

Explanation:

Given data:

Moles of silicon dioxide = 3 mol

Number of molecules = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

one mole = 6.022 × 10²³  atoms

3 mole × 6.022 × 10²³ atoms / 1mol

18.066  × 10²³atoms

2. What is the molar mass of Ag2S?

Molar mass of  Ag₂S = 247.8014 g/mol

Explanation:

The molar mass of a chemical compound is sum of atomic mass of all constituent atoms.

For Ag₂S

Atomic mass of Ag = 107.8682 amu

Atomic mass of S = 32.065 amu

There are two silver atoms that's why

107.8682 amu × 2= 215.7364

Molar mass of Ag₂S:

Molar mass of  Ag₂S =  215.7364 + 32.065

Molar mass of  Ag₂S = 247.8014 g/mol

3) In the balanced equation 4KO + 2CO2 = 2K2CO3 + CO3 Which two chemicals have a molar ratio of 3:4?

The equation:

4KO₂ + 2CO₂  → 2K₂CO₃ + 3O₂

In this balanced equation oxygen and potassium superoxide have ration 3:4.

Explanation:

Chemical equation:

4KO + 2CO₂  → 2K₂CO₃ + CO₃

The given equation does not have any two chemical ration 3:4.

The equation:

4KO₂ + 2CO₂  → 2K₂CO₃ + 3O₂

In this balanced equation oxygen and potassium superoxide have ration 3:4.

Coefficient with reactant and product.

Reactant                             Product

KO₂ = 4                             K₂CO₃ = 2

CO₂  = 2                            O₂ = 3

So KO₂ and oxygen have molar ratio 3 : 4 in balanced chemical equation.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.