2,16·10²⁴ = 21,6·10²³
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6,02·10²³ atoms ------ 1 mole of Ag
21,6·10²³ atoms ------ X
X = 21,6·10²³/<span>6,02·10²³
<u>X = 3,588</u> moles of silver
:)
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1. C
2. D (I’m not entirely sure)
3.energy can neither be created nor destroyed, only change forms.
4. C
5. A
6. C
I’ve researched and tried to answer these questions correctly.
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. Conduction is the transfer of heat between substances that are in direct contact with each other. Thermal energy is transferred from hot places to cold places by convection. Radiation is a method of heat transfer that does not rely upon any contact between the heat source and the heated object as is the case with conduction and convection. Heat can be transmitted through empty space by thermal radiation often called infrared radiation.
An empirical formula is a molecular formula D. reduced to the ratio of atoms involved.
An empirical formula has simplefied ratios, which makes it easier to work with. However, the accuracy is not that good
hope this helps
<u>Answer:</u> The concentration of ethene is 0.286 M
<u>Explanation:</u>
Rate law expression for first order kinetics is given by the equation:
![k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}](https://tex.z-dn.net/?f=k%3D%5Cfrac%7B2.303%7D%7Bt%7D%5Clog%5Cfrac%7B%5BA_o%5D%7D%7B%5BA%5D%7D)
where,
k = rate constant = ![2.25\times 10^{-2}s^{-1}](https://tex.z-dn.net/?f=2.25%5Ctimes%2010%5E%7B-2%7Ds%5E%7B-1%7D)
t = time taken for decay process = 15.0 s
= initial amount of the reactant = 0.500 M
[A] = amount left after decay process = ?
Putting values in above equation, we get:
![2.25\times 10^{-2}s^{-1}=\frac{2.303}{15.0s}\log\frac{0.500}{[A]}](https://tex.z-dn.net/?f=2.25%5Ctimes%2010%5E%7B-2%7Ds%5E%7B-1%7D%3D%5Cfrac%7B2.303%7D%7B15.0s%7D%5Clog%5Cfrac%7B0.500%7D%7B%5BA%5D%7D)
![[A]=0.357M](https://tex.z-dn.net/?f=%5BA%5D%3D0.357M)
The concentration of reactant consumed = (0.500 - 0.357) M = 0.143 M
For the given chemical reaction:
![C_4H_8\rightarrow 2C_2H_4](https://tex.z-dn.net/?f=C_4H_8%5Crightarrow%202C_2H_4)
1 mole of butene produces 2 moles of ethene
So, concentration of ethene = (2 × 0.143) M = 0.286 M
Hence, the concentration of ethene is 0.286 M