Answer:
12.7mol Na.
Explanation:
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In this case, according to the concept of mole, which stands for the amount of substance, we can recall the concept of Avogadro's number whereby we understand that one mole of any substance contains 6.022x10²³ particles, for the given atoms of sodium, we can calculate the moles as shown below:
Thus, by performing the division we obtain:
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There are also cases when a negative change in entropy can lead to a spontaneous reaction. According to this equation, if the free energy, G, of the system is negative, then the reaction is spontaneous.
Answer:
3.72
Explanation:
Given data:
Mass of object = 82.2 g
Volume of water = 25.0 mL
Volume of water + object = 47.1 mL
Density of object = ?
Solution:
Volume of object:
Volume of object = (Volume of water + object) - Volume of water
Volume of object = 47.1 mL - 25.0 mL
Volume of object = 22.1 mL
Density of object:
d = 82.2 g/ 22.1 mL
d = 3.72 g/mL