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3 years ago

10

the atomic number is the number of protons, but in a neutral atom it is also the number of _____. A. none of these B. electrons

C. neutrons D. nuclei

1 answer:

aksik [14]3 years ago

6 0

Answer:

Electrons

hope it helps

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Water has a higher specific heat index than other common materials, so it takes a lot of energy to raise the temperature of wate

Maurinko [17]

Answer: Areas surrounded by water would have less of a change in temperature

throughout the year.

Explanation: Water has a higher specific heat index so it's temperature will be slow to rise. Water also holds heat longer than most material hence areas sorrounsing water will have less temperature change throughout the year.

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4 years ago

How many moles are in 1.2×10^3 grams of ammonia

yuradex [85]

Ammonia is NH3. The molar mass of NH3 is 17.0307g.

(1.2*10^3)/17.0307=70.46 moles of NH3.

If you are using significant figures, it is 70. moles of NH3.

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3 years ago

Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 97. g of octane is mi

zhannawk [14.2K]

Answer: 61 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles of octane}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{97g}{114g/mol}=0.85moles$

$\text{Number of moles of oxygen}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{150g}{32g/mol}=4.69moles$

The chemical equation for the combustion of octane in oxygen follows the equation:

$2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O$

By stoichiometry of the reaction;

25 moles of oxygen react with 2 moles of octane

4.69 moles of oxygen react with= $\frac{2}{25}\times 4.69=0.37$ moles of octane

Thus, oxygen is the limiting reagent as it limits the formation of product and octane is the excess reagent.

25 moles of oxygen produce 18 moles of water

4.69 moles of oxygen produce= $\frac{18}{25}\times 4.69=3.38$ moles of water.

Mass of water produced= $moles\times {\text{Molar mass}}=3.38\times 18g/mol=61g$

The maximum mass of water that could be produced by the chemical reaction is 61 grams.

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3 years ago

An organic chemist combines 2-methyl-2-butanol with sodium dichromate in sulfuric acid and water. Which of the following best de

Valentin [98]

Answer:

SN1 = a stepwise loss of a leaving group to form a carbocation followed by nucleophilic attack

Explanation:

Since 2-methyl-2-butanol is tertiary alcohol, the first step will be loss of leaving group to form a 3° carbocation which is very stable and favours SN1, followed by attack of nucleophile

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4 years ago

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Which layer is divided into plates that move

stich3 [128]

The crust?? I gues brcause idk if thusnis correct sry

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3 years ago