Another name would be b. the SI System
Answer:
Yes
Explanation:
All living things do have cells
Answer:
The melting point of Gold is 1064.43 degrees celsius and the boiling point is 2807 degrees celsius.
Answer:
- <u>7.04 × 10²⁴ molecules of Na₂O</u>
Explanation:
<u>1) Balanced chemical equation (given):</u>
- 4 Na(s) + O₂ (g) → 2Na₂O (s)
<u>2) Mole ratio:</u>
<u>3) Number of moles of O₂ in 187 grams of oxygen:</u>
- Molar mass O₂ = 32.00 g/mol
- Number of moles = mass in grams / molar mass = 187 g / 32.00 g/mol = 5.844 mol
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<u>4) Number of moles of Na₂O:</u>
- Proportion: 1 mol O₂ / 2 mol Na₂O = 5.844 mol O₂ / x
- x = 5.844 mol O₂ (2 mol Na₂O / 1 mol O₂) = 11.688 mol Na₂O
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<u>5) Number of molecules</u>
- Number of molecules = number of moles × Avogadro's number
- Number of molecules = 11.688 mol × 6.022 × 10²³ molecules/mol =
= 7.04 × 10 ²⁴ molecules ← answer
The answer is rounded to three significant figures.
