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2 years ago

1. please answer i really need your help

Chemistry

2 answers:

myrzilka [38]2 years ago

7 0

1. solve the bracket (OH)3= 3 Oxygen, 3 Hydrogen

2. multiply 2Fe with (OH)3= 2*3= 6, 2*3=6

3. solve 2FE3= 2*3= 6FE

4. Add all= 6Fe+ 6oxygen+ 6H= Total atom 18

elixir [45]2 years ago

6 0

Answer:

Explanation:

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Calculate the mass of chloroform that contains 1.00X10^12 molecules of chloroform

Brums [2.3K]

<span>Molar mass of chloroform (CHCl3)
C = 1 * 12 = 12 a.m.u
H = 1 * 1 = 1 a.m.u
Cl = 3 * 35.5 = 106.5 a.m.u
Molar Mass (CHCl3) = 12 + 1 + 106.5 = 119.5 g / mol

Knowing that: The value of Avogadro's constant corresponds to approximately </span> $6,02*10^{23}$ molecules, if chloroform contains $1,00 * 10^{12}$ molecules. <span>
We have:

</span> $1,00 * 10^{12} * 6,02 * 10^{23} = 6,02 * 10 ^ {35} molecules$ <span>

Now, how many grams are there in the chloroform molecule?

grams -------- molecules</span><span>
119,5 </span>→ $6,02 * 10^{23}$
x → $6,02 * 10^{35}$

$6,02 * 10 ^ {23} * x = 119,5 * 6,02 * 10 ^{35}$
$6,02 * 10 ^ {23}x = 719,39 * 10^{35}$
$x = \frac{719,39}{6,02}*10^{35-23}$
$\boxed{x = 119,5*10^{12}grams}$

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2 years ago

What is the density of an object with a mass of 140 g and a volume<br> of 6 ml

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Answer:

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question we have

$density = \frac{140}{6} = \frac{70}{3} \\ = 23.3333...$

We have the final answer as

Hope this helps you

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Match the element with its description. Match Term Definition Sodium A) Has properties of both metals and nonmetals Silicon B) H

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Answer:

Sodium - malleable, soft, and shiny

Silicon - has properties of both metals and nonmetals

Bromine - highly reactive gas

Argon - non-reactive gas

Explanation:

Sodium is an alkaline metal. Just like other alkaline metals, it's malleable, soft, and shiny.

Silicon is a metalloid. Metalloids are elements that have properties of both metals and nonmetals.

Bromine a highly reactive chemical element. It is a fuming red-brown liquid at room temperature that evaporates to form a similarly coloured gas.

Argon is a noble gas. Just like other noble gases, it's non-reactive.

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