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erma4kov [3.2K]
2 years ago
15

I NEED HELP PLEASE, THANKS! :)

Chemistry
1 answer:
saw5 [17]2 years ago
3 0

Answer:

Macroscopic observation

Explanation:

The observation is macroscopic because you could observe the transformation with the naked eye.

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1235

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During the nuclear fission of plutonium-244, barium-144 produced, along with an unknown nucleus and three neutrons. What must be
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Combustion analysis of 0.300 g of an unknown compound containing carbon, hydrogen, and oxygen produced 0.5213 g of co2 and 0.283
Lyrx [107]
First, we have to get how many grams of C & H & O in the compound:
- the mass of C on CO2 = mass of CO2*molar mass of C /molar mass of CO2
                                        = 0.5213 * 12 / 44 = 0.142 g
- the mass of H atom on H2O = mass of H2O*molar mass of H / molar mass of H2O
                                                 =0.2835 * 2 / 18 = 0.0315 g
- the mass of O = the total mass - the mass of C atom - the mass of H atom
                          =  0.3 - 0.142 - 0.0315 = 0.1265 g
Convert the mass to mole by divided by molar mass
C(0.142/12) H(0.0315/2) O(0.1265/16) 
C(0.0118) H(0.01575) O(0.0079) by dividing by the smallest value 0.0079
C1.504 H3.99 O1 by rounding to the nearst fraction
C3/2 H4/1 )1/1 multiply by 2 
∴ the emprical formula C3H8O2
           



6 0
3 years ago
How many moles of water contain 1.3 x 10^24 molecules?
Vika [28.1K]
C is the correct answer
3 0
3 years ago
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