Answer:
1.89 × 10^-11 M
Explanation:
Recall that;
[H^+] [OH^-] = 1 × 10^-14
[H^+] = concentration of hydronium ions
[OH^-] = concentration of hydroxide ion
Where [OH^-] = 5.3 × 10−4 M
[H^+]= 1 × 10^-14/5.3 × 10−4
[H^+]= 1.89 × 10^-11 M
Answer: a bench made of composite plastic
Explanation:
The chemical weathering can be defined as the process in which a chemical causes the degradation and decomposition of the rocks into small particles. The iron rods, feldspar, and marble will weather considerably with a greater danger as the have a strong solid body. But plastic when exposed to a chemical agent usually melts and thus there is least or no danger of chemical weathering of plastic.
Answer:
computer model
Explanation:
Computer models are cheaper to set up than alternative methods that could be used to predict what will happen in a system, ex. building a prototype. Other benefits include being able to: make alterations and quickly see the outcomes.
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:
(a) The amount of O2 needed is 2.67 pounds.
(b) The volume required is 847,509 litres.
(c) The heat given off as a result of the combustion to CO2 is 393.5 kJ.
Explanation:
For a complete combustion of C to C02(g)
(a) The molecular mass of O2 is 32 g/mol and the molecular mass of C is 12 g/mol.
We need 1 mol O2 to burn 1 mol of C.
If we need 32 g of O2 to burn 12 g of C, to burn 1 pound of pure carbon charcoal we need (32/12)*1=2.67 pounds of O2.
(b) The density of O2, at atmospheric conditions, is 1.429 g/l. The volume of 2.67 pounds of O2 is
(c) To calculate the heat of the reaction, we have to look up in the Table of Standard Enthalpy of Formation Values and compute the following equation
The heat given off as a result of the combustion to CO2 is 393.5 kJ.