4.03 x 10²³ atoms
Explanation:
Given parameters:
Number of moles of FeTiO₃ = 0.67moles
Unknown:
Number of atoms = ?
Solution:
From the compound FeTiO₃ ;
1 mole of FeTiO₃ contains 1 mole of Ti atom
0.67 moles of FeTiO₃ will invariably have 0.67 moles of Ti atoms
A mole of any substance is the quantity of substance that contains the Avogadro's number of particles 6.02 x 10²³ particles
The particles are number of atoms, number of protons, neutrons, electrons, molecules e.t.c
1 mole of Ti = 6.02 x 10²³ atoms of Ti
0.67 moles of Ti = 0.67 x 6.02 x 10²³ = 4.03 x 10²³ atoms
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Number of atoms brainly.com/question/10419836
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Answer:
30.11 × 10²³ atoms
Explanation:
Given data:
Number of moles of gold = 5 mol
Number of atoms = ?
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.
1 mole = 6.022 × 10²³ atoms
5 mol × 6.022 × 10²³ atoms /1 mol
30.11 × 10²³ atoms
Answer:
Explanation:
Step 1
The question is based on the concept of PH and pOH calculations.
pH is defined as negative logarithmic of hydronium Ion concentration.
while pOH is defined as negative logarithmic of hydroxide ion concentration of the solution.
Step 2
[H+] = 7.7*10-7 M
pH = -log[H+]
= -log ( 7.7*10-7 )
= 6.12
Step 3
pOH = 14 - pH
= 14 - 6.11
= 7.89
I looked up the half life for nickel-63 and then used the half life formula which is No=Nt*e^(kt) so the final answer is 20000 years for 26g of nickel-63 to decay to 6.5g
