CHEMISTRY HIGH SCHOOL

Determine how many grams of KI are required to produce 1.2g of Pbl2-A) 0.43g
B) 0.86g
C) 1.67g
D) 3.33g

Answers

Answer 1
Answer: Molar mass KI = 166.0028 g/mol   and Pbl₂ = 461.0089 g/mol

2 Kl + Pb(NO₃)₂ ------> 2 KNO₃ + Pbl₂

2 x 166.0028 g ---------> 461.0089 g
           ? g KI -------------> 1.2 g

Mass KI = 1.2 x 2 x 166.0028 / 461.0089

Mass KI = 398.40672 / 461.0089

Mass KI = 0.86 g

Answer B

hope this helps!

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How will a positive and a negative charge react to each other

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Use Hess's law and the following equations to calculate the ΔHreaction for the reaction CO(g) + 3H2(g) CH4(g) + H2O(g). (Show your work.) (4 points) • C(s) + O2(g) CO(g) ΔH = –110.5 kJ • C(s) + 2H2(g) CH4(g) ΔH = –74.85 kJ • H2(g) + O2(g) H2O(g) ΔH = –241.83 kJ

Answers

Answer: The enthalpy of reaction is, -206.18 kJ

Explanation:-

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The final reaction is

CO(g)+3H_2(g)\rightarrow CH_4(g)+H_2O(g)    \Delta H_(rxn)=?

The intermediate balanced chemical reaction will be,

(1) C(s)+(1)/(2)O_2(g)\rightarrow CO(g)     \Delta H_1=-110.5kJ

(2) C(s)+2H_2(g)\rightarrow CH_4(g)    \Delta H_2=-74.85kJ

(3) H_2(g)+(1)/(2)O_2(g)\rightarrow H_2O(g)    \Delta H_3=-241.83kJ

Now adding (2) and (3) and subtracting (1) , we get :

\Delta H_(rxn)=(\Delta H_2+\Delta H_3)-\Delta H_1

\Delta H_(rxn)=((-74.85)+(-241.83))-(-110.5)

\Delta H_(rxn)=-206.18kJ

Therefore, the enthalpy of reaction is, -206.18 kJ

Final answer:

To calculate the ΔHreaction for the given reaction using Hess's Law, we need to manipulate the given equations and sum up the ΔH values. After manipulating the equations and summing up the ΔH values, the ΔHreaction is -280.03 kJ.

Explanation:

To calculate the ΔHreaction for the given reaction, we can use Hess's Law. We need to manipulate the given equations to match the overall reaction. Since the overall reaction involves CO, H2, CH4, and H2O, we can use the given equations as follows:

  1. Reverse the equation for CO(g) + O2(g) → CO(g) to get CO(g) → C(s) + O2(g).
  2. Double the equation for C(s) + 2H2(g) → CH4(g) to get 2C(s) + 4H2(g) → 2CH4(g).
  3. Leave the equation for H2(g) + O2(g) → H2O(g) as is.

Add up the manipulated equations and their respective ΔH values:

  • CO(g) → C(s) + O2(g) (ΔH = 110.5 kJ)
  • 2C(s) + 4H2(g) → 2CH4(g) (ΔH = -2 * 74.85 kJ = -149.7 kJ)
  • H2(g) + O2(g) → H2O(g) (ΔH = -241.83 kJ)

Now, sum up the ΔH values:

110.5 kJ + (-149.7 kJ) + (-241.83 kJ) = -280.03 kJ

Therefore, the ΔHreaction for the reaction CO(g) + 3H2(g) → CH4(g) + H2O(g) is -280.03 kJ.

Learn more about Hess's Law here:

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How many significant figures does 546.000 have

Answers

This has only only three sig figs because it is 546.000 the zeros are just place holders so thus meaning they are not significant. It is just another way to write 546 because in that number there is also 3 sig figs. They are just trying to throw you off. Just watch out because if the example is 540 then it is just two significant digits, and it were to be 540. then it be three cause that "." makes the zero significant.  

Answer:

Its 7

Explanation:

I took the test...

A solid-state component with three layers of semiconductors is a

Answers

A solid-state component with three layers of semiconductors is a transistor. 

Answer: A solid-state component with three layers of semiconductors is a transistor.

Explanation:

A device with the help of which current or voltage is regulated and for electronic signals it acts as a switch or gate is known as a transistor.

A transistor has three layers of semiconductors. Each of these layers are capable of carrying current.

Thus, we can conclude that a solid-state component with three layers of semiconductors is a transistor.

What makes an atom able to form a compound? * O different number of neutron than protons O unfilled outer electron shells O same number of protons as electrons O a positive ot negative charge of the nucleus​

Answers

Answer:

same number of protons as electrons

Explanation:

The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element. ... If you change the number of electrons in an atom, you will get an ion of the element.

PLS PLS SOMEONE HELP ME ANSWER THESE QUESTIONS PLEEEAAASSSE!!(press on the picture so you can see the questions better!)​

Answers

Answer:

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Explanation:

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