Answer:
9.8 × 10²⁴ molecules H₂O
General Formulas and Concepts:
<u>Atomic Structure</u>
- Reading a Periodic Table
- Moles
- Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
<u>Organic</u>
<u>Stoichiometry</u>
- Analyzing reaction rxn
- Using Dimensional Analysis
Explanation:
<u>Step 1: Define</u>
[RxN - Unbalanced] CH₄ + O₂ → CO₂ + H₂O
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 130 g CH₄
<u>Step 2: Identify Conversions</u>
Avogadro's Number
[RxN] 1 mol CH₄ → 2 mol H₂O
[PT] Molar Mass of C: 12.01 g/mol
[PT] Molar Mass of H: 1.01 g/mol
Molar Mass of CH₄: 12.01 + 4(1.01) = 16.05 g/mol
<u>Step 3: Stoichiometry</u>
- [DA] Set up conversion:
![\displaystyle 130 \ g \ CH_4(\frac{1 \ mol \ CH_4}{16.05 \ g \ CH_4})(\frac{2 \ mol \ H_2O}{1 \ mol \ CH_4})(\frac{6.022 \cdot 10^{23} \ molecules \ H_2O}{1 \ mol \ H_2O})](https://tex.z-dn.net/?f=%5Cdisplaystyle%20130%20%5C%20g%20%5C%20CH_4%28%5Cfrac%7B1%20%5C%20mol%20%5C%20CH_4%7D%7B16.05%20%5C%20g%20%5C%20CH_4%7D%29%28%5Cfrac%7B2%20%5C%20mol%20%5C%20H_2O%7D%7B1%20%5C%20mol%20%5C%20CH_4%7D%29%28%5Cfrac%7B6.022%20%5Ccdot%2010%5E%7B23%7D%20%5C%20molecules%20%5C%20H_2O%7D%7B1%20%5C%20mol%20%5C%20H_2O%7D%29)
- [DA] Divide/Multiply [Cancel out units]:
![\displaystyle 9.75526 \cdot 10^{24} \ molecules \ H_2O](https://tex.z-dn.net/?f=%5Cdisplaystyle%209.75526%20%5Ccdot%2010%5E%7B24%7D%20%5C%20molecules%20%5C%20H_2O)
<u>Step 4: Check</u>
<em>Follow sig fig rules and round. We are given 2 sig figs.</em>
9.75526 × 10²⁴ molecules H₂O ≈ 9.8 × 10²⁴ molecules H₂O
Answer:
D
Explanation:
A weak acid and a strong base will form a basic salt.
Option A is acidic, this pH would be found in salts formed from reactions between strong acids and weak bases.
B and C are neutral or close to neutral and as such will be formed from weak acids and weak bases, or strong acids and strong bases.
It’s the third one because Cl has 17 protons bc of the numeric number and 18 electrons bc it’s always the opposite and 18 neutrons because you subtract 35-17=18
It creates chlorofluorocarbons(CFCs) also would create biooxygen but in the multiple choice it only shows the CFCs