Answer:
a. [H+]= 1.35x10^-5 M
b.5.4x10^-3%
Explanation:
a) pH= - log [H+]
[H+]= 10^-pH [H+]= 10^-4.87 [H+]= 1.35x10^-5 M
b) HCN -> H + CN at equilibrium [H+]=[CN-]
0.250 M -> 100%
1.35x10^-5 M ->x
x=(1.35x10^-5 M * 100)/0.250M
x=5.4x10^-3%
Answer:
9
Explanation:
a significant number is a non zero number or exponent or a zero between numbers
Answer:
The answer to your question is 6 moles of oxygen
Explanation:
Data
methanol = CH₃OH
number of moles = 4
moles of oxygen = ?
Process
1.- Write and balance the chemical reaction
2CH₃OH + 3O₂ ⇒ 2CO₂ + 4H₂O
Reactants Elements Products
2 Carbon 2
8 Hydrogen 8
8 Oxygen 8
2.- Calculate the moles of oxygen
2 moles of methanol ----------------- 3 moles of oxygen
4 moles of methanol ------------------ x
x = (4 x 3) / 2
x = 12/2
x = 6
1. 2.408 x 10²⁴ molecules
2. 2.408 x 10²⁴ atoms
3. 4.816 x 10²⁴ atoms
<h3>Further explanation</h3>
Given
4 moles of Carbon dioxide.
Required
Carbon dioxide molecules
Carbon atoms
Oxygen atoms?
Solution
1 moles = 6.02 x 10²³ particles(molecules, atoms, ions)
1. Carbon dioxide molecules :
= 4 moles x 6.02 x 10²³
= 2.408 x 10²⁴ molecules
2. The number of Carbon atoms
In CO₂, there is 1 atom C, so the number of atoms :
= 1 x 2.408 x 10²⁴
= 2.408 x 10²⁴ atoms
3. The number of Oxygen atoms :
In CO₂, there is 2 atom O, so the number of atoms :
= 2 x 2.408 x 10²⁴
= 4.816 x 10²⁴ atoms