A. good conductors is not a characteristic of metals out of all the other followings.
Answer:
I think it's B
Explanation:
I think it is b because if the number is positive the zeroes will be on the left so you move the decimal to the right to get rid of the zeroes.
<span>21.6 grams
The balanced equation for the reaction is
Cu + 2AgNO3 ==> 2Ag + Cu(NO3)2
So you can easily determine that for each mole of copper used, 2 moles of silver are produced. So let's lookup the atomic weights of copper and silver.
Atomic weight copper = 63.546
Atomic weight silver = 107.8682
Moles copper = 6.35 g / 63.546 g/mol = 0.099927611 mol
Since we'll produce 2 moles of silver per mole of copper used, we get
0.099927611 mol * 2 = 0.199855223 mol
And to get the mass, just multiply by the atomic weight of silver. So
0.199855223 * 107.8682 = 21.55802316 g
Finally, round to 3 significant figures, giving 21.6 g.</span>
You have to use the equation q=mcΔT and solve for T(final).
T(final)=(q/mc)+T(initial)
q=the amount of energy absorbed or released (in this case 868J)
m=the mass of the sample (in this case 15.6g)
c= the specific heat capacity of the substance (in this case 2.41 J/g°C)
T(initial)=the initial temperature of the sample (in this case 21.5°C)
When you plug everything in, you should get 44.6°C.
Therefore the final temperature of ethanol is 44.6°C
I hope this helps. Let me know if anything is unclear.
The primary greenhouse gases<span> in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Without </span>greenhouse gases<span>, the average temperature of Earth's surface would be about −18 °C (0 °F), rather than the present average of 15 °C (59 °F).</span>
