For a closed system, you need two things:
1) a conservation of mass within the boundaries of the system
2) the ability to freely exchange energy to & from the "closed" system with a surrounding external system
So, the answer is <u><em>never</em></u>, since your defining the "system" as the water within the bathtub, and an open bathtub is exposed to evaporation, which is not conserving mass within the defined "system".
i dont have a clue i dont know h ave a lcue
Answer:
The density of the metal is 3.457 g/cm³.
Explanation:
Given,
mass of metal = 121 grams
Volume = 35 cm³.
Density = ?
Density of the metal can be found by using the formula
Density = Mass/Volume
Substituting the values,
Density = 121/35 = 3.457 g/cm³.
<em>Balance</em> <em>Chemical equation:</em>
- C4H6O6 + 2NaOH ⇒ Na2C4H4O6 + 2H2O
<em>Given Data:</em>
Molarity of NaOH =0.3000
Vol. of NaOH = 21.65
<em>Solution:</em>
moles of NaOH = (0.3000 × 21.65)÷1000 = 0.0064 mol
According to balance chemical equation
NaOH : C4H6O6
2 : 1
0.0064 = (1/2) ×0.0064 = 0.0032 mol
So these 0.0032 mol of tartaric acid are prsent in 50.0 ml of solution.
So in I littre of solutions, its concentration will be as follow
M = 0.0032 × 1000/50 = 0.064 M
<em>Result: </em>
- The concentration of acid will be 0.064 M.
Answer:
Option B. [Ar] 4s² 3d⁷
Explanation:
The condensed form of the electronic configuration of of cobalt, Co can be written by using the closest noble gas element before the cobalt element.
Cobalt has atomic number of 27. The noble gas element before cobalt is argon (Ar).
Thus, we can write the electronic configuration of cobalt, Co as follow
Co (27) => [Ar] 4s²3d⁷
