**Answer:**

During phase change (e.g. gas to liquid/liquid to solid vice versa), there is no temperature change observed. Thermal energy is not used to increase the kinetic energy of the particles, but to break the intermolecular forces. Thus, the temperature remains constant as all the thermal energy is used up and none of it is absorbed or released.

Alpha (α), beta (β-) and gamma (γ) decay. When the nucleus of an atom possesses either too many or too few neutrons compared to the number of protons it becomes unstable. These are called radioactive isotopes. Unstable nuclei split up in a process called radioactive decay and emit radioactive radiation.

Mass over volume

200 over100

2

<span>Solving for the percent composition by mass of sulfur. The formula would be:
%S = mass of sulfur / mass of compound x 100%
Plugging in our data:
%S = 32 amu / 120 amu x 100%
%S = 0.266666 x 100%
%S = 26.66%
Rounded off to two significant numbers it will be 27%. Therefore the answer is number 2.</span>

**Answer:**

**1.3005 M**

**Explanation:**

Given that,

**Mass of NaCl** =

Molar mass of NaCl=

The formula for calculation of moles,

Moles,

Given that volume

Molarity,

**Therefore the molarity is 1.3005 M.**