Answer:
ATOMIC MASS = Protons + Neutrons
34+43 = 77
Atomic Mass is 77
BRAINLIEST PLEASE
As far as I remember, the needed formula for squaric acid is C4H2O4.
According to this one mole should be 114.06 g., which means we have <span>0.015mol of this acid.
Then we can easly calculate : </span><span>4(0.015) = 0.06 mol for both for Carbon and Oxygen and </span><span>0.03 mol of Hydrogen.
</span><span>To get more clear answer, we multiply by avogadros :
</span><span>6.022 x 10^23. Hope everything is clear! regards</span>
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
Energy is a property that is transferred to a physical system, recognizable in the performance of work and in the form of heat and light.
A small sample of methane undergoes combustion. As the hot gas mixture expands, it releases energy (E).
- It releases 120.0 kJ of heat. By convention, when heat is released, we assign it a negative sign. Thus, q = -120.0 kJ.
- It does 830.0 kJ of work. By convention, when the system does work on the surroundings, we assign it a negative sign. Thus, w = -830.0 kJ.
The change in the energy is the sum of the heat released and the work done.
ΔE = q + w = -120.0 kJ + (-830.0 kJ) = -950.0 kJ
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
Learn more about energy here: brainly.com/question/13881533
"EMPIRICAL FORMULA" tells that!!
Answer:5
Explanation:In order to be able to say how many sig figs are used for the measurement 811.40 g, you need to know that
<span><span>
non-zero digits are always significant</span><span>
a trailing zero that follows a decimal point and a non-zero digit is always significant</span></span>
In your case, the measurement
<span>811.40</span>
has four non-zero digits and one significant trailing zero.
<span><span><span>8,1,1,4</span>→</span> non-zero digits<span><span>8,1,1,</span>0→</span> significant trailing zero</span>
Therefore, you can say that this measurement has <span>five significant figures</span>
<span>811.40→</span> <span>five significant figures</span>
