Fe(NO3)2 not sure how to get the oxidation numbers of all elements

Answers

Answer 1

Answer: You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
3*(-2) from oxygens + 1 from hydrogen = -5
so nitrogen must have +5 oxidation number... because sum all in formula must be 0.

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Sodium chloride, NaCl forms in this reaction between sodium and chlorine. 2Na(s) + Cl2(g) → 2NaCl(s) How many moles of NaCl result from the complete reaction of 3.9 mol of Cl2? Assume that there is more than enough Na.

Answers

Answer: 7.8 moles of NaCl result from the complete reaction of 3.9 mol of $Cl_2$

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}*{\text{Molar Mass}}$

$\text{Moles of} Cl_2=3.9mol$

$2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)$

As $Na$ is the excess reagent, $Cl_2$ is the limiting reagent as it limits the formation of product.

According to stoichiometry :

1 mole of $Cl_2$ gives = 2 moles of $NaCl$

Thus 3.9 moles of $Cl_2$ will give= $\frac{2}1}* 3.9=7.8moles$ of $NaCl$

7.8 moles of NaCl result from the complete reaction of 3.9 mol of $Cl_2$

Write the balanced molecular equation and net ionic equation for the neutralization reaction between hydrochloric acid and strontium hydroxide. Include the phase of each species.

Answers

Answer:

the net ionic equation is H+(aq) + OH-(aq)----->H2O(l)

Explanation:

In conclusion to the earlier solution, 2H+(aq) + 2OH-(aq)----->2H2O(l) can be broken down because they all have the same coefficient. So divide both sides by 2.

The net ionic equation will be H+(aq) + OH-(aq)----->H2O(l)

Final answer:

The balanced molecular equation for the neutralization reaction between Hydrochloric acid (HCl) and Strontium hydroxide (Sr(OH)2) is HCl(aq) + Sr(OH)2(aq) -> SrCl2(aq) + 2H2O(l). Its net ionic equation is 2H+(aq) + 2OH-(aq) -> 2H2O(l). Spectator ions are eliminated during the formulation of the net ionic equation.

Explanation:

A neutralization reaction between hydrochloric acid and strontium hydroxide can be represented by the balanced molecular equation: HCl(aq) + Sr(OH)2(aq) -> SrCl2(aq) + 2H2O(l). Breaking it down into the total ionic equation we will have: H+(aq) + Cl-(aq) + Sr2+(aq) + 2OH-(aq) -> Sr2+(aq) + 2Cl-(aq) + 2H2O(l). This can be simplified by removing the spectator ions to obtain the net ionic equation: 2H+(aq) + 2OH-(aq) -> 2H2O(l). This aligns with the principle that in a neutralization reaction, an acid reacts with a base to form water and a salt.

Learn more about Neutralization Reaction here:

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Which value has more significant figures?
A)2.63x10^6 B)0.0000026

Answers

Answer:

use Google this will help you alot and also use chegg

18. which bond is most polar? H--F H--Cl H--Br H--I

Answers

H--F is the mist polar because there is a bigger difference between the electronegativity numbers of fluorine and hydrogen than with the others. The periodic trend for electronegativity is diagonally with cesium being the lowest and flourine being the highest

A gas at 255 kilopascals and 45°C has an initial volume of 2.00L. The pressure of the gas increases to 805 kilopascals as the temperature is raised to 255°C. What will be the new volume?1.05 liters
2.28 liters
1.25 liters
0.44 liters
1.50 liters

Answers

Answer : The correct option is, (a) 1.05 liters

Solution :

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

$(P_1V_1)/(T_1)=(P_2V_2)/(T_2)$

where,

$P_1$ = initial pressure of gas = 255 kpa

$P_2$ = final pressure of gas = 805 kpa

$V_1$ = initial volume of gas = 2 L

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $45^oC=273+45=318K$

$T_2$ = final temperature of gas = $255^oC=273+255=528K$

Now put all the given values in the above equation, we get the final volume of gas.

$(255kpa* 2L)/(318K)=(805kpa* V_2)/(528K)$

$V_2=1.05L$

Therefore, the final or new volume of gas will be, 1.05 liters

Please help!!!Which layer of the sun is shown extending into space in the picture above?

Group of answer choices

Corona

Radiative zone

Convective zone

Photosphere

Answers

Corona is the answer

Answer:

Corona

Explanation:

Is the answer so yeah...

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