Answer:
the electron cloud model is the current model of atom
Answer:
The correct answer is 0.11 mol O₂
Explanation:
The chemical equation for the reaction of acetylene (C₂H₂) with O₂ to produce carbon dioxide (CO₂) and water (H₂O) is the following:
2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)
The chemical equation is balanced : with the proper estequiometrical coefficients. According to this, 2 moles of C₂H₂ reacts with 5 moles of O₂ to give 4 moles of CO₂ and 2 moles of H₂O.
In order to calculate how many moles of O₂ are needed to produce 0.085 moles of CO₂, we multiply the 0.085 moles of CO₂ by the factor 5 moles O₂/4 moles CO₂ (because 4 moles of CO₂ are produced by 5 moles of O₂ according to the chemical equation):
0.085 moles CO₂ x (5 moles O₂/4 moles CO₂) = 0.10625 moles O₂ = 0.11 moles O₂
Answer:
Mass = 4.5 g
Explanation:
Given data:
Number of atoms of iron = 4.85 ×10²² atoms
Mass of iron = ?
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,
4.85 × 10²² atoms of iron / 6.022 × 10²³ atoms × 1 mol
0.081 mol
Mass of iron:
Mass = number of moles × molar mass
Mass = 0.081 mol × 55.85 g/mol
Mass = 4.5 g
The molecule is symmetric, a tetrahedron. Thus, the 4 polar bonds cancel each other out. (It is easier to see with a one dimensional molecule like CO2, which is linear with the C in the middle. The 2 polar bonds cancel each other.
