Answer is A
You never run down adjacent to you spinal cord and bones. That’s where they are the most protected. There are also holes in the pelvis bone for nerves to pass through
Answer:
= 72.73%
Explanation:
The percentage by mass of an element is given by;
% element = total mass of element in compounds/molar mass of compound × 100
The mass of oxygen in carbon dioxide = 32 g
Molar mass of CO2 = 44 g
Therefore;
% of O2 = 32/44 × 100%
<u>= 72.73%</u>
Answer:
moles Na = 0.1114 g / 22.9898 g/mol=0.004846
moles Tc = 0.4562g /98.9063 g/mol=0.004612
mass O = 0.8961 - ( 0.1114 + 0.4562)=03285 g
moles O = 0.3285 g/ 15.999 g/mol=0.02053
divide by the smallest
0.02053/ 0.004612 =4.45 => O
0.004846/ 0.004612 = 1.0 => Tc
to get whole numbers multiply by 2
Na2Tc2O 9
Explanation:
Hope it right hope it helps
Answer:
The answers are: (a )0.0058 M; (b) 0.00681 M; (c) 0.006912 M
Explanation:
Ionic strenght= μ= 1/2 ∑ c z²
Where c is the concentration of each ion (in M) and z is the charge of the ion. So, to calculate the ionic strenght of a solution you have to know the concentration of each ion and their charges. For this, the dissociation equilibrium is required.
a) HCl → H⁺ + Cl⁻
Conc H⁺= 0.00580 M
Conc Cl⁻= 0.00580 M
μ= 1/2 x ((Conc H⁺)(+1)²) + ((Conc Cl⁻)(-1)²
μ= 1/2 x ((0.00580 M) + (0.00580 M))
μ= 0.00580 M
b) CaBr₂ → Ca²⁺ + 2 Br⁻
Conc Ca²⁺= 0.00227 M
Conc Br⁻= 2 x 0.00227 M= 0.00454 M
μ= 1/2 ((Conc Ca²⁺)(+2)² + ((Conc Br⁻)(-1)²)
μ= 1/2 (0.00227 M (4)) + (0.00454 M)
μ= 0.00681 M
c) The solution has two dissociation equilibria:
Mg(NO₃)₂ → Mg²⁺ + 2 NO₃⁻
La(NO₃)₃ → La³⁺ + 3 NO₃⁻
Conc Mg²⁺= 0.000752 M
Conc NO₃⁻= 2 x (0.000752 M) + 3 x (0.000776 M)= 0.003832 M
Conc La³⁺= 0.000776 M
μ= 1/2 ((Conc Mg²⁺)(+2)²)+ ((Conc NO₃⁻)(-1)²) + ((Conc La³⁺)(+3)²)
μ= 1/2 (0.000752 M(4)) + (0.003832 M) + (0.000776 M)(9))
μ= 0.006912 M