Answer:
Explanation: I think its 4.91 x 10^25. Im not very sure, i just multipled 1.15 mol by the molar mass of Cl 2, which was 70.9 g. Then I multiplied that by avogadro's number. sorry if im wrong
Symbols on the periodic table represent an element.
Cl is also known as chlorine.
First we need to convert grams in moles.
1 mole of calcium has 40 grams of calcium.
72.8 grams are:
72.8/40=1.82 moles
Now we use Avogadro's number to determine number of atoms in 1.82 moles
Number of moles N is:
N=1.82 * 6.02*10^23 = 1.0956 * 10^24 atoms.
Answer:Entropy is defined as the measure of a system's thermal energy per unit temperature that is unavailable for doing work. The second law of thermodynamics states that the entropy of an isolated system never decreases over time
Explanation:
Entropy equal to change in mass divided by change in temperature
From above given M1 = 45.04g = 0.045kg
M2 = 35.04g = 0.036kg
T1 = -12.5oC, T2=100oC
Change in entropy of the system = (0.045 - 0.036)/ (100-(-12.5))
=0.009/112.5
=0.04
Circumpolar constellations stay in the sky. Because of the rotation of the Earth and its orbit around the Sun, we divide the stars and constellations into two groups. Some stars & constellations never rise nor set, and they are called circumpolar.
