You need to find the formula mass of NaCl first, which you find the amu of both sodium and chlorine on the periodic table and you add them both. Then you divide the 175.5g by the formula mass which I got 58 g to get 3.026 moles of NaCl. 4 sig figs because of the 175.5. I recommend doing it on your own to make sure you get the right answer. You divide the 175.5g of NaCl by the formula mass.
Well, the molar mass of acetone would be
3(12.011)+6(1.008)+15.999 , which cleans up to be 58.08 grams.
out of this total, 3(12.011), or 36.033 grams are carbon
So, to find the percent, you do part over whole
36.033/58.08, which equals 0.6204 with significant figures
multiply that by 100 to get 62.04%
Hope that helps!
I'd recommend checking out some videos on youtube to get some good examples worked out, for example, the video "<span>How to Balance Chemical Equations in 5 Easy Steps: Balancing Equations Tutorial" is done well.</span>
Answer:
5. electrical.
Explanation:
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In this case, since the energy can be manifested in different forms of energy, when talking about electronic devices such as cellphones, computers, consoles and all of them, as they are powered by electric sources, we infer that the answer in this case is 5. electrical
, since thermal energy is associated to the temperature, light and sound to the energy carried by a wave and mechanical to a work done.
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