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lesantik [10]
2 years ago
5

Design a course of action for the development of a building project in

Chemistry
2 answers:
bixtya [17]2 years ago
7 0

Answer:

A, B & C form the vertices of a triangle.

∠ CAB = 90°, ∠ ABC = 73° and AB = 9.4.

Calculate the length of BC rounded to 3 SF

IrinaK [193]2 years ago
7 0
We need to build wildlife corridors for the prevention of road accidents.

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Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produce
Elodia [21]

Answer:  600 kJ

-

Explanation:

                        C₃H₈ (g)  + 5 O₂ (g) =============== 3 CO₂ (g)  +  4 H₂O (l)

Δ⁰Hf   kJ/mol       -104             0                                       -393.5         -285.8

Δ⁰Hcomb C₃H₈ = 3(-393.5) + 4 (-285.80) - (-104)  kJ/mol

Δ⁰Hcomb = 2219.70 kJ/mol

n= m /MW   MW c₃H₈ = 44.1 g/mol

n= 12 g/44.1 g/mol = 0.27 mol

then for 12 g the heat released will be

0.27 mol x 2219.70 kJ/mol =  600 KJ

4 0
2 years ago
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MaRussiya [10]
The amplitude of a wave is the distance between a point on one wave and the identical point on the next wave. The period and wavelength of a wave are inversely proportional.
7 0
3 years ago
This equation is balanced: N2+H2 -NH3 <br><br>A. True <br><br>B. False​
Makovka662 [10]
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8 0
3 years ago
There are 2 grams of sulfur and 0.45 grams of copper. What is the
Elanso [62]

Answer:

18.3%

Explanation:

Add the numbers together, and then take the number of grams of the substance, in this case copper, not coppper lol. divide the .45 by 2.45 to get 18.3

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How is polypropylene commonly used?
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