Answer:
1.62 × 10⁻³ M s⁻¹
Explanation:
Let's consider the following reaction.
2 NO₂ + F₂ = 2 NO₂F
The generic rate law is:
rate = k × [NO₂]ᵃ × [F₂]ᵇ
where,
- a and b: reaction orders with respect to the reactants
The reaction is first order in NO₂ and first order in F₂ and the rate constant is k = 1.58 × 10⁻⁴ M⁻¹ s⁻¹.
The rate law is:
rate = 1.58 × 10⁻⁴ M⁻¹ s⁻¹ × [NO₂] × [F₂]
When [NO₂] = 2.84 M and [F₂] = 3.60 M, the reaction rate is:
rate = 1.58 × 10⁻⁴ M⁻¹ s⁻¹ × 2.84 M × 3.60 M
rate = 1.62 × 10⁻³ M s⁻¹
Answer:
The easiest way to determine if a 1943 cent is made of steel, and not copper, is to use a magnet. If it sticks to the magnet, it is not copper. If it does not stick, the coin might be of copper and should be authenticated by an expert
Explanation:
Answer:
8.5 × 10²² atom / cm³, 2.125 × 10²² unit cells / cm³, 4.7 × 10⁻²³ cm³ / cell unit, 3.61 × 10⁻⁸ cm /cell
Explanation:
The density of the solid Cu = 8.96 g/cm³
a) number of atoms present
mole = mass / molar mass = (8.96 g/cm³) / 63.546 = 0.141 mol
number of atoms = mole × avogadro's constant = 0.141 × 6.02 × 10²³ = 8.5 × 10²² atom / cm³
b) a face-centered cubic unit cell contains 4 atoms
8.5 × 10²² atom / cm³ / 4 = 2.125 × 10²² unit cells / cm³
c) the volume of a unit cell of the metal = reciprocal of 2.125 × 10²² unit cells / cm³ = 1 ÷ ( 2.125 × 10²² unit cells / cm³ ) = 4.7 × 10⁻²³ cm³ / cell unit
the edge length of a cell of cu = ∛(4.7 × 10⁻²³ cm³ / cell unit) = 3.61 × 10⁻⁸ cm /cell
