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3 years ago

Hi! I need some help with this pleaseeee!!

Chemistry

1 answer:

german3 years ago

6 0

A) eventually they will be in thermal equilibrium

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1. What determines the reactivity of an atom?

Veronika [31]

The number of electrons in the outermost shell of an atom determines<span> its </span>reactivity<span>.</span><span>
</span>

5 0

4 years ago

How many atoms of K are present in 195.49 grams of K? 3.0110 × 1024 6.0220 × 1024 1.1772 × 1026 4.5797 × 1027

Ierofanga [76]

<h2>Hello!</h2>

The answer is: $3.0110x10^{24}$

First, we need to look for the K molecular mass:

$K=39,098 g/mol$

Also, we need to remember that 1 mol of a compound or element is equal to $6,022x10^{23}$ of that compound.

From the statement, we are asked to calculate how many atoms of K are present in 195,49 of K.

So, doing the calculations, we have:

$195,49g*\frac{1mol}{39,08}*\frac{6,022x10^{23} atoms}{1 mol K} =3,0110x10^{24} \\$

So, we have $3.0110x10^{24}$ atoms of K in 195,49 grams of K.

Have a nice day!

3 0

3 years ago

The density of a pure substance is its mass per unit volume. The density of ethylene glycol has been measured to be 1097.gL. Cal

Svetlanka [38]

Answer: The mass of 405 mL of ethylene glycol is 444.3 g.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

Given :

Density of the ethylene glycol= $1097g/L$

Volume of the ethylene glycol= $405ml$ = 0.405 L (1L=1000ml)

Mass of the ethylene glycol = ?

Putting in the values we get:

$1097g/L=\frac{x}{0.405L}$

$x=444.3g$

Thus the mass of 405 mL of ethylene glycol is 444.3 g

5 0

3 years ago

_c h 3 c h 2 c o o h+ _0 2 -》 _h 2 o + co2 how many molecules of o2 are required for the complete combustion of 6 moles of propa

lesya692 [45]

Answer:

21 molecules of oxygen.

Explanation:

The balanced equation is

2CH3CH2COOH + 7O2 -----> 6CO2 + 6H2O.

So 2 molecules of propanoic acid require 7 moles of oxygen.

Therefore 6 molecules require 7/2 * 6 = 21 molecules of oxygen.

3 0

4 years ago

Give the name for H3PO3 oxyacid

Nana76 [90]

Answer:

The answer to your question is: Phosphorous acid

Explanation:

Phosphorous can form 2 main acids

H₃PO₃ is called phosphorous acid

H₃PO₄ is called phosphoric acid

6 0

4 years ago