Answer:
b, H2O(s) r H2O(g)
Explanation:
entropy is heat, so increase in heat would mean water gets evaporated or melted, or both in this case. so the only choice above that showed increase in heat is from solid(ice) to gas(water vaper) due to increase in heat in the reaction.
Answer:
25 mL
Explanation:
Step 1: Given data
- Concentration of the concentrated solution (C₁): 2 M
- Volume of the concentrated solution (V₁): ?
- Concentration of the diluted solution (C₂): 0.1 M
- Volume of the diluted solution (V₂): 0.500 L
Step 2: Calculate the volume of the concentrated NaCl solution
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.1 M × 0.500 L / 2 M
V₁ = 0.025 L = 25 mL
Answer:
![\large \boxed{\textbf{32.7 g}}](https://tex.z-dn.net/?f=%5Clarge%20%5Cboxed%7B%5Ctextbf%7B32.7%20g%7D%7D)
Explanation:
We will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.
MM: 102.89 159.81
2NaBr + F₂ ⟶ 2NaF + Br₂
m/g: 25.4
(a) Moles of Br₂
![\text{Moles of Br$_{2}$} = \text{25.4 g Br$_{2}$}\times \dfrac{\text{1 mol Br$_{2}$}}{\text{159.81 g Br$_{2}$}}= \text{0.1589 mol Br$_{2}$}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20Br%24_%7B2%7D%24%7D%20%3D%20%5Ctext%7B25.4%20g%20Br%24_%7B2%7D%24%7D%5Ctimes%20%5Cdfrac%7B%5Ctext%7B1%20mol%20Br%24_%7B2%7D%24%7D%7D%7B%5Ctext%7B159.81%20g%20Br%24_%7B2%7D%24%7D%7D%3D%20%5Ctext%7B0.1589%20mol%20Br%24_%7B2%7D%24%7D)
(b) Moles of NaBr
![\text{Moles of NaBr} = \text{0.1589 mol Br$_{2}$} \times \dfrac{\text{2 mol NaBr }}{\text{1 mol Br$_{2}$}} = \text{0.3179 mol NaBr}](https://tex.z-dn.net/?f=%5Ctext%7BMoles%20of%20NaBr%7D%20%3D%20%5Ctext%7B0.1589%20mol%20Br%24_%7B2%7D%24%7D%20%5Ctimes%20%5Cdfrac%7B%5Ctext%7B2%20mol%20NaBr%20%7D%7D%7B%5Ctext%7B1%20mol%20Br%24_%7B2%7D%24%7D%7D%20%3D%20%5Ctext%7B0.3179%20mol%20NaBr%7D)
(c) Mass of NaBr
![\text{Mass of NaBr} =\text{0.3179 mol NaBr} \times \dfrac{\text{102.89 g NaBr}}{\text{1 mol NaBr }} = \textbf{32.7g NaBr}\\\\\text{The reaction produces $\large \boxed{\textbf{32.7 g}}$ of NaBr}](https://tex.z-dn.net/?f=%5Ctext%7BMass%20of%20NaBr%7D%20%3D%5Ctext%7B0.3179%20mol%20NaBr%7D%20%5Ctimes%20%5Cdfrac%7B%5Ctext%7B102.89%20g%20NaBr%7D%7D%7B%5Ctext%7B1%20mol%20NaBr%20%7D%7D%20%3D%20%5Ctextbf%7B32.7g%20NaBr%7D%5C%5C%5C%5C%5Ctext%7BThe%20reaction%20produces%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B32.7%20g%7D%7D%24%20of%20NaBr%7D)
The correct answer is C. Show's different parts of a system working together to reach the same end goal.