Fe + 2 HCl --> FeCl2 + H2 <span>
2 Al + 6 HCl --> 2 AlCl3 + 3 H2
<span>total moles H2 = 0.100 g / (2.016 g/mol) =0.0496 mol
let x = mass Fe
let y = mass Al
</span></span>
<span>Total mass of alloy is:
<span>x + y = 2.07
</span></span>
<span>Performing H2 balance based on stoichiometry:
<span>x / 55.847 + 3 y/2 / 26.9815 = 0.0496
x / 55.847 + 3y/53.963 = 0.0496
<span>53.963 x + 167.541 y = 149.48
<span>53.967 ( 2.07 - y) + 167.541 y = 149.48
<span>111.71 - 53.967 y + 167.541 y = 149.48
<span>113.6 y = 37.77
y = 0.332 g = mass Al
% Al = 0.332 x 100/ 2.07 = 16.06 %
<span>% Fe = 83.94%</span></span></span></span></span></span></span>
Number of photons can be calculated by dividing the needed energy by the energy per photon.
The minimum energy needed is given as 2 x 10^-17 joules
Energy per photon = hc / lambda where h is planck's constant, c is the speed of light and lambda is the wavelength
Energy per photon = (<span>6.626 x 10^-34 x 3 x 10^8) / (475 x 10^-9)
= 4.18 x 10^-19 J
number of photons = (2 x 10^-17) / (4.18 x 10^-19)
= 47.79 photons which is approximately 48 photons</span>
1.covalent bond
2A bond angle is the angle between two bonds originating from the same atom in a covalent species
3. 1.Write the Lewis dot structure for the molecule.
2.Use the steric number and VSEPR theory to determine the electron domain geometry of the molecule.
3. Use the VSEPR shape to determine the angles between the electron domains.
Exothermic reaction = the term exothermic process describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light, electricity,
Endothermic reaction = An endothermic process is any process with an increase in the enthalpy H (or internal energy U) of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.
Answer:organic compound is : C₄H₈
Explanation: The equation of the reaction of the organic compound burning with excess oxygen gives us the general equation as
C xHy + 1/2(x+ y/2 )O₂ → xCO₂ + y/2H₂O
We first find the number of moles of CO₂ and H₂O
Number of moles of CO₂= Mass/ molar mass
= 17.6g/ 44g/mol ( 12+ 16 x2)
=0.4 moles
Number of moles of H₂O= Mass/ molar mass
= 7.2g/ 18g/mol ( 1 X 2+ 16)
=0.4 moles
From the reaction , we can see that
x = 0.4
and = 0.4 such that y= 0.4 x 2= 0.8
Their ratios become
==
Therefor the organic compound CxHy = C₄H₈