3 years ago

What is the atomic mass of an atom that contains 21 protons, 21 electrons, and 25 neutrons

Chemistry

1 answer:

dybincka [34]3 years ago

8 0

44.95591 atomic mass units

Have a Merry Christmas!

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Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

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Answer:

group 1

Explanation:

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How much power is required to lift a 2.0kg mass at a speed of 2.0m/s

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According to the balanced chemical equation

Nadusha1986 [10]

Answer:

A) 15.5 mL

Explanation:

Given, Mass of oxalic acid = 0.3500 g

Molar mass of oxalic acid = 90.03 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{0.3500\ g}{90.03\ g/mol}$

$Moles\ of\ oxalic\ acid= 0.0038876\ mol$

According to the given reaction:

$5H_2C_2O_4_{(aq)}+2MnO_4^-_{(aq)}+6H^+_{(aq)}\rightarrow 10CO_2_{(g)}+2Mn^{2+}_{(aq)}+8H_2O_{(l)}$

5 moles of oxalic acid react with 2 moles of potassium permanganate

Thus,

1 mole of oxalic acid react with 2/5 moles of potassium permanganate

0.0038876 mole of oxalic acid react with $\frac {2}{5}\times 0.0038876$ moles of potassium permanganate

Moles of potassium permanganate = 0.001555 moles

Also, considering:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Molarity = 0.100 M

So,

$0.100=\frac{0.001555}{Volume\ of\ the\ solution(L)}$

Volume = 0.01555 L

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Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to the ground. A

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Explanation:

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