I need help with this bill nye worksheet. someone help. It's due tomorrow cant mess my grade up. I just picked a random subject
but it's science.(7th grade)
1 answer:
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Answer:
25.0 g.
Explanation:
- From the solubility curve that is shown in the attached image, the solubility of KCl per 100.0 g of water is about 50.0 g.
- <em>So, a saturated solution of KCl in 50.0 g of water will contain about 25.0 g.</em>
- <em>Thus, the grams of the dry salt that will be recovered is 25.0 g.</em>
Answer:
510 g NO₂
General Formulas and Concepts:
- Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.
- Reading the Periodic Table
- Writing Compounds
- Using Dimensional Analysis
Explanation:
<u>Step 1: Define</u>
6.7 × 10²⁴ molecules NO₂ (Nitrogen dioxide)
<u>Step 2: Define conversions</u>
Avogadro's Number
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NO₂ - 14.01 + 2(16.00) = 46.01 g/mol
<u>Step 3: Use Dimensional Analysis</u>
<u /> = 511.901 g NO₂
<u>Step 4: Check</u>
<em>We are given 2 sig figs. Follow sig fig rules.</em>
511.901 g NO₂ ≈ 510 g NO₂