**Answer:**

Several of the nonmetals are gases in their elemental form. Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2).

**Explanation:**

Well I had to Google this one because I really was not sure.. so, if I am right.. it should be friction

1.02*Avogandro's number (6.02*10^23)=

Answer: 6.14*10^23

**Answer:**

Uruguay became independent of Spain in 1811 and was annexed by Brazil until 1825. Following a three-year federation with Argentina, Uruguay became an independent nation in 1828. Thirty years later, the United States established diplomatic relations with Uruguay and the two nations have since maintained close ties.

**Explanation:**

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There are **0.0172 moles **of **chlorine gas **initially in the vessel.

Suppose we take a look and consider the **reaction **between **P4 **and **Cl2**, the balanced **chemical equation** between them can be expressed as:

Given that:

- mass of P₄ = 250 mg = 0.25g
- pressure of Cl₂ = 4.21 atm
- volume of the reactor = 100 mL = 0.1 L
- temperature = 298 K

Using the **Ideal gas equation**, the **number **of **moles **of **chlorine gas **that were initially present in the **vessel **is:

PV = nRT

Making **(n)** the subject of the formula:

**n = 0.0172 moles **

Therefore, we can conclude that there are **0.0172 moles **of **chlorine gas **initially in the vessel.

Learn more about the **Ideal gas equation **here:

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