Answer:
final reaction to get is 2C(graphite) + H2(g) → C2H6(g)
First step: 2C(graphite) + 2O2(g) → 2CO2 (g) ΔH = (-393.5 x 2)
3H2(g) + 3/2O2(g) → 3H2O(l) ΔH = (-285.8 x 3)
2CO2(g) + 3H2O(l) → C2H6(g) + 7/2O2(g) ΔH = (-3119.6 X -1/2)
Second step: 2C(graphite) + 2O2(g) + 3H2(g) + 3/2O2 (g) + 2CO2(g) + 3H2O(l) → 2CO2(g) + 3H2O(l) + C2H6(g) + 7/2O2(g)
Third step: 2C(graphite) + O2(g) → C2H6(g)
ΔH final = (-393.5 x 2) + (-285.8 x 3) + (-3119.6 x -1/2) = -84.6 KJ/mol
Explanation: Using Hess Law
In the first step, rearrange the 3 given reactions in a way that they match the final reaction by multiplying or dividing (also the ΔH) by a given number and by reverse (if so the multiply by -1).
In the second step, add all 3 reactions with reactant on their side and product on theirs.
In 3rd step, cancel out similarity in the product and reactant(such as there are (2+3/2 = 7/2)O2 which cancels with 7/2O2 in the product) .
finally, add all 3 ΔH to find the final one which is -84.6 KJ/mol
1. c
2. a
3. a
(I’m not 100% but 2 & 3 couldn’t be transform)
I think its chlorine Im not positive but im 99.9 precent shure
Answer:
Determine the frequency of light with a wavelength of 2.775⋅10−7 cm. Answer in units of Hz?❤
Answer:
Explanation:
Density is the mass per unit volume of a substance. It is calculated by dividing the mass by the volume.
The mass of the mineral is 48.6 grams. The volume is 18 milliliters.
Substitute the values into the formula.
Divide.
The density of the mineral sample is <u>2.7 grams per milliliter.</u>