Chemistry College

What is the percentage by mass of chromium in sodium dichromate (VI) Na2
Cr2
O7
?​

Answers

Answer 1

Answer:

39.7%

Explanation:

To obtain the percentage composition of chromium (Cr) in Na₂Cr₂O₇, do the following:

Molar mass of Na₂Cr₂O₇ = (23×2) + (52×2) + (16×7)

= 46 + 104 + 112

= 262 g/mol

Mass of Cr in Na₂Cr₂O₇ = 2 × 52 = 104 g

Percentage composition of Cr = mass of Cr / Molar mass of Na₂Cr₂O₇ × 100

= 104 / 262 × 100

= 39.7%

Thus, the percentage composition of chromium (Cr) in Na₂Cr₂O₇ is 39.7%

Related Questions

The pressure 15.0 m under water is 248 kPa.
What is this pressure in torr

Answers

Answer:

1860 torr

Explanation:

In order to convert from kPa to torr, we are going to use the following conversion factor:

1 kPa = 7.5 torr

Now we multiply 248 kPa with this factor so that the kPa units cancel each other and only the torr units remain:

248 kPa * [tex]\frac{7.5torr}{1kPa}[/tex] = 1860 torr

This means that the answer is 1860 torr.

What are the main parts of a simple electrie motor, like the one found inside a remote control car? O a generator, wires, and turbine magnets and coils of wire O electromagnets only​

Answers

Answer:

A DC power supply, commutator, rotor armature, axle, and a field magnet.

Which of the following is true?
A)If we know that a reaction is an elementary reaction, then we know its rate law.
B)The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism.
C)Since intermediate compounds can be formed, the chemical equations for the elementary reactions in a multistep mechanism do not always have to add to give the chemical equation of the overall process.
D)In a reaction mechanism, an intermediate is identical to an activated complex.
E)all of these statements are true.

Answers

Answer:

If we know that a reaction is an elementary reaction, then we know its rate law.

Explanation:

An elementary reaction is a reaction that takes place in one reactive encounter. This means that the two species interact in a single step to give the products.

If two reactants interact in a single step to yield the products then we can easily deduce the rate law from the reaction equation.

For instance, For the reaction;

2A + B → C

The rate law is

rate = k[A]²[B].

If the reaction is an elementary reaction and the equation of the reaction is balanced, then we can deduce the rate law from the balanced reaction equation.

A relationship in which one variable increases as the other variable decreases is an inverse relationship.
CA. True
B. False

Answers

Answer:

TRUE

Explanation:

HOPE IT WILL HELP YOU

What is the activation energy of a reaction?
A. The energy that is given off when a reaction happens
B. The kinetic energy of the colliding molecules
C. The speed at which the molecules must be moving in order to
react
D. The energy the molecules must have in order to react
SUBMIT

Answers

Answer:

D i took it aswell

Explanation:

The energy the molecules must have in order to react. Hence, option D is correct.

What is activation energy?

Activation energy is the sufficient amount of energy necessary to initiate a chemical reaction.

It can also be said as the minimum amount of energy needed to energize molecules or atoms so that they can undergo a chemical reaction or transformation.

Hence, the energy the molecules must have in order to react.

Learn more about activation energy here:

brainly.com/question/2410158

#SPJ5

What is the formula for Decaoxygen pentasulfide

Answers

Answer:

Compound Formula. 1, Carbon dioxide, CO2. 2, Carbon monoxide, CO. 3, Diphosphorus pentoxide, P2O5. 4, Dinitrogen monoxide, N2O.

Explanation:

dont even know by thoAnswer:

Explanation:

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