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luda_lava [24]
3 years ago
7

Someone help me pleasee?

Chemistry
1 answer:
Kamila [148]3 years ago
7 0
Maybe its the second one
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solution is prepared by adding 18 mL of 0.200 M Fe(NO3)3and 2 mL of 0.0020 M KSCN. Calculate the initial concentrations of Fe3 a
Dmitrij [34]

Answer : The initial concentration of Fe^{3+} and SCN^- in the solution are, 0.200 M and 0.0020 M respectively.

Explanation :  Given,

Concentration of Fe(NO_3)_3 = 0.200 M

Concentration of KSCN = 0.0020 M

As, 1 mole of  Fe(NO_3)_3 dissociate then it gives 1 mole of Fe^{3+} ion and 3 moles of NO_3^- ion.

So, 0.200 M of  Fe(NO_3)_3 dissociate then it gives 0.200 M of Fe^{3+} ion and (3×0.200 M) of NO_3^- ion.

and,

As, 1 mole of  KSCN dissociate then it gives 1 mole of K^{+} ion and 1 mole of SCN^- ion.

So, 0.0020 M of  KSCN dissociate then it gives 0.0020 M of K^{+} ion and 0.0020 M of SCN^- ion.

Thus, the initial concentration of Fe^{3+} and SCN^- in the solution are, 0.200 M and 0.0020 M respectively.

3 0
4 years ago
4NO + 3O2 + 2H2O = 2.4 moles of NO 2.4 moles of O2 and 2.4 moles of H2O react and 2.0 moles of HNO3 are recovered from the react
Vaselesa [24]

Answer:

83%

Explanation:

Percent yield is 100 times the ratio between actual yield (2.0moles HNO₃) and theoretical yield. To find theoretical yield:

As you can see in the reaction:

4NO + 3O₂ + 2H₂O → 4HNO₃

4 moles of NO are required when 3 moles of O₂ and 2 moles of H₂O reacts. As equal moles of each reactant are added, the limiting reactant is NO because is the substance that requires more moles to react.

2.4 mol NO produce 2.4 mol HNO₃-Because 4 moles of NO produce 4 moles of HNO₃. That means theoretical yield is 2.4 moles and percent yield is:

2.0 moles / 2.4 moles * 100 = 83%

7 0
3 years ago
What is used to determine the number of each atom in an ionic formula
ladessa [460]

Answer:

The charge carried by each ion (oxidation state of each atom)

Explanation:

If we have an ionic compound and we want to write its formula, we must first know the magnitude of charge on each ion (shown as oxidation state of the atoms involved) because the magnitude of charge on each ion is eventually crisscrossed and gives the subscript (number of atoms) for each atom in the formula.

For instance, let us write the formula of calcium bromide. Ca has a charge of +2 while Br has a charge of -1. If we exchange the charges and ignore the signs such that the crisscrossed charges form subscripts we can now write; CaBr_{2}.

3 0
3 years ago
When a lithium ion and nitrate ion combine, the result is:
maxonik [38]
LiNO3; nitrate has a charge of -1, and lithium has a charge of +1
7 0
3 years ago
Read 2 more answers
A 100 mL sample of a gas has a pressure of 1.92 atm. What would the volume of the gas be at a pressure of 2 atm, if temperature
alex41 [277]

Answer:

New volume V2 = 96 ml

Explanation:

Given:

Old volume V1 = 100 ml

Old pressure P1 = 1.92 atm

New pressure P2 = 2 atm

Find:

New volume V2

Computation:

Using Boyle's Law

P1V1 = P2V2

(1.92)(100) = (2)(V2)

V2 = 96

New volume V2 = 96 ml

6 0
3 years ago
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