In which pair do both compounds exhibit predominantly ionic bonding? question 5 options: scl6 and hf na2so3 and nh3 ki and o3 li
1 answer:
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Answer:
Explanation:
Heat of combustion is the amount of heat released when 1 mole of the compound is completely burnt in the presence of oxygen.
To calculate the moles, we use the equation:
Thus of sucrose releases = 916.6 J of heat
1 mole of sucrose releases = of heat
Thus ∆H value for the combustion reaction is
Answer:
1.20 × 10²⁴ atoms He
General Formulas and Concepts:
<u>Chemistry - Atomic Structure</u>
- Reading a Periodic Table
- Using Dimensional Analysis
- Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
Explanation:
<u>Step 1: Define</u>
8.00 g He
<u>Step 2: Identify Conversions</u>
Avogadro's Number
Molar Mass of He - 4.00 g/mol
<u>Step 3: Convert</u>
<u /> = 1.2044 × 10²⁴ atoms He
<u>Step 4: Check</u>
<em>We are given 3 sig figs. Follow sig fig rules and round.</em>
1.2044 × 10²⁴ atoms He ≈ 1.20 × 10²⁴ atoms He