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Lina20 [59]
3 years ago
12

An alloy contains 59g of pure silver and 19g of pure copper. What is the silver in the alloy

Chemistry
1 answer:
Lyrx [107]3 years ago
6 0

59+19=78

78----->59

100------>59*100/78

this percentage silver in the alloy

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What do the parentheses mean in a chemical reaction and how they are used
galben [10]

Parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.

<u>Explanation:</u>

In a chemical reaction, sometimes, a compound may be composed of group of polyatomic ions with other ions. Some of the polyatomic ions are sulfate, carbonate, nitrate, hydroxide, bicarbonate, ammonia etc.

So these polyatomic ions are formed by combining two or more elements. Thus, if the number of polyatomic ions in a compound is more than one, then we use parathesis and write those polyatomic ions in it and write the number of polyatomic ions present in the compound as subscript of the parathesis.

For example, Fe₂(SO₄)₃

So here SO₄ is a polyatomic ion and in the compound 3 atoms of SO₄ is required to neutralize the compound and thus paranthesis is used. Thus, parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.

5 0
3 years ago
5.4 When looking down the C{{TOP-HAT-MATH-TOKEN-0}}-C{{TOP-HAT-MATH-TOKEN-1}} bond in 2,3-dimethylbutane, what is the most stabl
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Answer:

The most stable conformer would be the anti-conformer when the substituent methyl groups are farthest away from each other.

Explanation:

Isomers are chemical compounds with the same molecular formula but with different molecular structures.

Conformers are a special type of isomers that produce different structures when the substituents of a Carbon-Carbon single bond (C-C) are rotated.

In 2,3 dimethyl butane, the substituent methyl groups are located around the second and third Carbon to Carbon single bond.

To achieve a stable configuration, the methyl group substituents need to be as far apart as possible (that is, in an anti-position) to minimise repulsion.

The closer the methyl groups are to each other, the more they repel each other and the more unstable the conformer becomes.

7 0
3 years ago
A 10.0 % (m/m) solution of potassium chloride, KCl dissolved in water has a density of 1.06 g/mL. What is the molar concentratio
hodyreva [135]

Answer:

1,42M

Explanation:

Molar concentration is given in moles of solute per liter o solution. Assuming you have 100g of solution:

10g KCl × (1mol / 74,55g) = <em>0,134 moles of KCl</em>

As you have 100g of solution:

100g × (1mL / 1,06g) × (1L / 1000mL) = <em>0,0943L</em>

<em> </em>

That means molar concentration is:

0,134 moles of KCl / 0,0943L = <em>1,42M</em>

<em></em>

I hope it helps!

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