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3 years ago

Какая система называется моделью химия

Chemistry

2 answers:

OlgaM077 [116]3 years ago

8 0

I don’t understand, what does that say in english?

lutik1710 [3]3 years ago

3 0

Answer:

Я уверен, что это модель Бора

Я могу ошибаться

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An organic compound containing C,H and O only. Has 29.6% O by mass. Its relative .olecular mass is 270. How many Oxygen atoms ar

Ostrovityanka [42]

Answer:

12.1% C, 16.1% O, 71.8% Cl

Explanation:

i hope this is correct

6 0

3 years ago

What is the molar mass of methanol (CH3OH)?

HACTEHA [7]

Molar mass of methanol=12 + 1×3 + 16 + 1=32g
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3 years ago

Read 2 more answers

How many moles of carbon are there in 5 g of carbon?

Umnica [9.8K]

Answer:

0.416666667

Explanation:

number of moles= mass of sample ÷ molar mass

=5÷12

=0.41666667

8 0

3 years ago

Which is the largest in size? OA. A. a star O B. a planet O c. an asteroid D. a galaxy E. a supernova E.

Genrish500 [490]

Answer:

galaxy

Explanation:

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8 0

4 years ago

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

Also, 1 L = 1000 mL

So, volume = 15.5 mL

6 0

3 years ago