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Savatey [412]
3 years ago
7

What is the percent by mass of potassium in KFe(CN)?

Chemistry
1 answer:
vladimir1956 [14]3 years ago
8 0

Answer:

Explanation:

1. Add the atomic mass of all the elements.

39+55.8+12+14= 120.8

2.Divide atomic mass of potassium by total atomic mass

39/120.8= .323

2. Multiply by 100

.323*100= %32.3 %32.3

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Which statements are true regarding redox reactions? (Note that in redox reactions, the molecule that "causes" another to gain o
Dvinal [7]

Answer:A, C, D, E, F

Explanation:

A. True: Oxidizing agents are electron acceptors. They accept electrons and the get reduced. This means their oxidation number reduces

B. False: Reducing agents do not accept H+ ions. Reducing agents remove oxygen from another substance or give hydrogen to it.

C. True: oxidizing agents oxidizes other molecules but they accept electrons and get reduced themselves. If a molecule accepts electrons it has been reduced.

D True: Redox reactions MAY and may not involve the transfer of hydrogen ions depending on the reactants (H+). But redox in terms of acid and base means the donating and receiving of protons(H+)

E. True: A molecule that has gained H atoms is said to be reduced. Oxidizing agents are always the proton acceptor.

F. True: Oxidizing agents May and may not accept H+. In terms of acid and base oxidizing agents accept protons(H+)

4 0
3 years ago
PLEASE HURRY I'LL GIVE BRAINLYEST TO THE BEST ANSWER Give some examples of something that can cause changes to ecosystems. It ca
jok3333 [9.3K]

Answer:

A hurricane,tornado,wind, rain.

Explanation:

Those are examples of a natural process which impact and ecosystem.

8 0
3 years ago
At some temperature for the equilibrium PX3(g) + X2(g) # PX5(g) the equilibrium constant is 0.74. At the same temperature the eq
mariarad [96]

Answer: The equilibrium constant for PX_5(g)\rightarrow PX_3(g)+X_2(g) is 1.35

Explanation:

Equilibrium constant is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as K_c  

For the given chemical reaction:

PX_3(g)+X_2(g)\rightarrow PX_5(g)

The expression for K_c is written as:

K_c=\frac{[PX_5]^1}{[PX_3]^1[X_2]^1}

0.74=\frac{[PX_5]^1}{[PX_3]^1[X_2]^1}

For the reverse chemical reaction:

PX_5(g)\rightarrow PX_3(g)+X_2(g)

The expression for K_c' is written as:

K_c'=\frac{[PX_3]^1[X_2]^1}{[PX_5]^1}

K_c'=\frac{1}{K_c}=\frac{1}{0.74}=1.35

The equilibrium constant for PX_5(g)\rightarrow PX_3(g)+X_2(g) is 1.35

4 0
3 years ago
PLEASE HELP
andriy [413]

The atomic mass of the element = 24.309547

<h3>Further explanation</h3>

Given

Isotopes of Mg

Required

The atomic mass

Solution

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

The atomic mass of the element(Mg) :

= 23.98504 . 0.7870 + 24.98584 . 0.1013 + 25.98259 . 0.1117

= 18.876226 + 2.531066 + 2.902255

= 24.309547

6 0
3 years ago
4. NH4Cl<br> What is the compound?
Ludmilka [50]

Answer:

ammonium chloride

Explanation:

Because NH is ammonium and Cl is chlorine

5 0
3 years ago
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