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3 years ago

Chemistry test!!! no fake answers please and if you can explain then do it because I need all the help I can get!

Chemistry

1 answer:

ivanzaharov [21]3 years ago

8 0

Answer:

(−ΔH°1)+12(−ΔH°2)+(ΔH°3)+(ΔH°4)

I hope this helps you out!! :)

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Which statement is true for all minerals?

ss7ja [257]

A. because atoms create crystal structures to form different kind of materials

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3 years ago

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Each substance in a solution mixture is visible to the naked eye? True or False

konstantin123 [22]

False
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4 0

3 years ago

a sample of solid is decomposed and found to contain 6.52g of potassium, 4.34 g of chromium and 5.34 of oxygen, what is the empi

Fynjy0 [20]

Answer:

K₂CrO₅

Explanation:

The empirical formula is the simplest formula of a compound. To find the empirical formula, we follow the procedure below:

Elements Potassium Chromium Oxygen

Mass 6.52 4.34 5.34

Molar mass 39 60 16

Number of moles 6.52/39 4.34/60 5.34/16

0.167 0.072 0.333

Divide through by

the smallest 0.167/0.072 0.072/0.072 0.333/0.072

2.3 1 4.6

2 1 5

Empirical formula K₂CrO₅

5 0

3 years ago

How does air bubbles affect density of a solid object?

kirill [66]

it decreases the density of the object the air bubbles take up space. it increases the volume of the object slightly but the objects weight remains the same, hence the objects density decreases

6 0

3 years ago

Titanium and chlorine react to form titanium(IV) chloride, like this:

leva [86]

Answer:

the value of equilibrium constant for the reaction is 8.5 * 10⁷

Explanation:

Ti(s) + 2 Cl₂(g) ⇄ TiCl₄(l)

equilibrium constant Kc = $\frac{1}{[Cl_2]^2}$

Given that,

We are given:

Equilibrium amount of titanium = 2.93 g

Equilibrium amount of titanium tetrachloride = 2.02 g

Equilibrium amount of chlorine gas = 1.67 g

We calculate the No of mole = mass / molar mass

mass of chlorine gas = 1.67 g

Molar mass of chlorine gas = 71 g/mol

mole of chlorine = 1.67 / 71

= 7.0L

Concentration of chlorine is = no of mole / volume

= 0.024 / 7

= 3.43 * 10⁻³M

equilibrium constant Kc = $\frac{1}{[Cl_2]^2}$

= $\frac{1}{[3.43 * 10^-^3]^2}$

= 8.5 * 10⁷

4 0

3 years ago