Answer:
Empirical formula is C₂H₄O
Explanation:
Given data:
Percentage of hydrogen = 9.15%
Percentage of carbon = 54.53%
Percentage of oxygen = 36.32%
Empirical formula of butyric acid = ?
Solution:
Number of gram atoms of H = 9.15 / 1.01 = 9.1
Number of gram atoms of O = 36.32 / 16 = 2.27
Number of gram atoms of C = 54.53 / 12 = 4.54
Atomic ratio:
C : H : O
4.54/2.27 : 9.1/2.27 : 2.27/2.27
2 : 4 : 1
C : H : O = 2 : 4 : 1
Empirical formula is C₂H₄O.
Answer:
The correct answer is: a. Southern California and Australia.
Explanation:
The solar power, in order to be more efficient and more productive, needs to be produced in places that have a lot of sunny days throughout the year. So the wisest and most practical thing to do is to install solar panels at places that are warm and sunny for most of the year. The southern part of California and most of Australia would be excellent choices for something like this. Both places have predominantly warm weather throughout the year, and more important, they have a lot of sunny days throughout the year. That provides the perfect conditions for harvesting the solar energy and use it as an energy source.
Using Hess' Law, we can calculate the heat of reaction of the gasification of coal. Multiplying the second reaction by 2 and reversing the third reaction:
<span>C(s) + O2(g) → CO2(g) ∆H=-394 kj
2H2(s) + O2(g) → H2O(l) ∆H=-572kj
</span>CO2(g) + 2H2O(l) → CH4(g) + 2O2(g) ∆H=891kj
Adding the three reaction would result to
<span>C(s) + 2H2(g) → CH4(g) ∆H = -394 + -572 + 891 = -75 kJ
The answer is
</span><span>(B) -75 kJ
</span>
The number of particles (molecules or atoms) is: 6.022 x 10²³ particles (atoms or molecules).
1 mol of H₂O has 6.022 x 10²³ molecules.
1 mol of Al has 6.022 x 10²³ atoms.