Answer:
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
Answer:
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?
Answer:
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?
Answer:
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.
