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polet [3.4K]
2 years ago
7

Identify the elements that are found as liquids at room temperature. What is the state of matter of the majority of the elements

???????
Chemistry
2 answers:
Yakvenalex [24]2 years ago
6 0

Answer:

<em><u>The two liquid elements at room temperature are mercury (symbol Hg and atomic number 80) and bromine (symbol Br and atomic number 35). Mercury is the only metal that is a liquid at room temperature.</u></em><em><u> </u></em>

Explanation:

<em><u>Hope</u></em><em><u> </u></em><em><u>it helps</u></em><em><u> </u></em><em><u>you</u></em><em><u> </u></em><em><u>✌️</u></em>

<em><u>Mark</u></em><em><u> </u></em><em><u>me as</u></em><em><u> </u></em><em><u>Brainleist</u></em>

<em><u>Have</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>good day</u></em><em><u> </u></em>

N76 [4]2 years ago
3 0


Mercury (Metal) is in liquid form at room temperature
Bromine (Non-Metal) is in liquid form at room temperature

Most of the elements are solid, 11 gases and 6 liquids
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According to the reaction, 4 mol HNO₃ will react with 1 mol Cu and produce 1 mol Cu²⁺. Since we have 0.237 mol HNO₃, the amount of Cu that could react would be (0.237 mol HNO₃ * 1 mol Cu / 4 mol HNO₃) 0.06 mol. This reaction would produce 0.060 mol Cu²⁺, however, only 0.010 mol Cu²⁺ were obtained, indicating that only 0.010 mol Cu were present in the mixture. This means that the acid was in excess, so we can assume that all copper present in the mixture has reacted.

Since 0.010 mol of Cu²⁺ were produced, the amount of Cu was 0.01 mol.

1 mol of Cu has a mass of 63.5 g, then 0.01 mol has a mass of:

0.01 mol Cu * 63.5 g / 1 mol = 0.635 g.

Since this amount was present in 2.00 g mixture, the amount of copper in 100 g of the mixture will be:

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