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Lena [83]
3 years ago
13

Predict the number of each atom needed to form a molecule of potassium Sulfide.

Chemistry
1 answer:
vladimir2022 [97]3 years ago
8 0

Answer:

2.0 atoms of K and 1.0 atom of S are needed to form a molecule of potassium sulfide.

Explanation:

  • The potassium sulfide has the chemical formula <em>K₂S.</em>

∴ Every 1.0 molecule of K₂S composed of 2.0 atom of K and 1.0 atoms of S.

<u><em>So, 2.0 atoms of K and 1.0 atom of S are needed to form a molecule of potassium sulfide.</em></u>

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wariber [46]
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3 0
3 years ago
Iodine-131 is administered orally in the form of NaI(aq) as a treatment for thyroid cancer. The half-life of iodine-131 is 8.04
evablogger [386]

Answer:

16.6 mg

Explanation:

Step 1: Calculate the rate constant (k) for Iodine-131 decay

We know the half-life is t1/2 = 8.04 day. We can calculate the rate constant using the following expression.

k = ln2 / t1/2 = ln2 / 8.04 day = 0.0862 day⁻¹

Step 2: Calculate the mass of iodine after 8.52 days

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ln I = ln I₀ - k × t

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8 0
3 years ago
A balloon contains 5 L of oxygen at a pressure of 90 kPa. How much oxygen will the balloon contain if the pressure is lowered to
laila [671]
Answer is: volume will be 6,7 L.
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p</span>₁V₁ = p₂V₂.
90 kPa · 5 L = 67 kPa · V₂.
V₂ = 90 kPa · 5 L / 67 kPa.
V₂ = 6,7 L, but same amount of oxygen.


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3 years ago
How can you tell that a gas is a halogen? ___?
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Hope this helps : D
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Romashka-Z-Leto [24]

Answer:

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Explanation:

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Nucleotides are building blocks of the nucleic acids. They are the molecules which are composed of three sub units which are:  

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