3. If an element has 47 protons and 54 neutrons what is the element and what is its atomic

Chemistry

1 answer:

garik1379 [7]3 years ago

5 0

3.Ag(silver) the atomic mass is 106.42
4.Nb(Niobium) the atomic mass is 92.906
5.

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Which occurs at a larger a wavenumber

pav-90 [236]

Answer:

The C-O stretch of phenol

Explanation:

Electron delocalization causes the of the phenol to have partial double bond character, whereas the of the cyclohexanol is a pure single bond. Again, we know as the bond order or bond strength increases the absorption occurs at larger wave number. So, the stretch of the phenol occurs at larger wave number.

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3 years ago

Which is the least likely indicator that a chemical change has taken place in a substance?

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Change in state of matter

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4 years ago

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2. The alcohol in "gasohol" burns according to the following equation.

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Answer: 36.9 moles

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moles are three times of amount of ethanol.

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3 years ago

Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 te

Igoryamba

Answer:

8.61 mL of the HCl solution

Explanation:

The reaction that takes place is:

2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O

From the given mass of Mg(OH)₂, we can calculate <u>the moles of HCl that are neutralized</u>:

4x10² mg = 400 mg = 0.400g

0.400g Mg(OH)₂ ÷ 58.32g/1mol = 6.859*10⁻³ mol Mg(OH)₂

6.859*10⁻³ mol Mg(OH)₂ * $\frac{1molHCl}{1molMg(OH)_{2}} =$ 3.429x10⁻³ mol HCl

Finally, to calculate the volume of an HCl solution, we need both the moles and the concentration. We can <u>calculate the concentration using the pH value</u>: