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Vlada [557]
3 years ago
6

A block of dry ice (-40°C) is placed in contact with an ice cube (-10°C).

Chemistry
1 answer:
const2013 [10]3 years ago
3 0

Explanation:

Answer is that : no heat will flow

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Under which conditions will sugar most likely dissolve fastest in a cup of water?
zheka24 [161]
If the cup of water contained hot water. Sugar will dissolve a lot slower if it was in room temperature and even slower if it was in cold water.
3 0
2 years ago
An unknown compound contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 2.77 g sample of the compound
alisha [4.7K]

The molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

<h3>Molecular formula of the compound</h3>

The molecular formula is calculated as follows;

CHNO  +  O₂ ------------> CO₂  + H₂O

Mass of carbon, C:  = (6.64 x 12)/44 = 1.81 g in 2.77 g sample

Mass of hydrogen, H: = (1.67 x 2)/18 = 0.186 g in 2.77 g sample

Mass of Nitrogen, N: = (2.77 x 0.143)/1.69 = 0.234 g

Mass of oxygen, O:  = 2.77 g - 1.81 g - 0.186 g - 0.234 g = 0.54 g

<h3>molar ratio of the elements: </h3>

C = 1.81 g = 0.15 mol

H = 0.186 g = 0.186 mol

N = 0.234 g = 0.017 mol

O = 0.54 g = 0.0337 mol

divide through with the smallest number of moles (0.017 mol);

C = 9

H = 11

N = 1

O = 2

Molecular formula = C₉H₁₁NO₂

Check the molar mass of the compound = (9 x 12) + (11 x 1) + (14) + (2 x 16) = 165 g/mol

Thus, the molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

Learn more about molecular mass here: brainly.com/question/21334167

#SPJ1

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1 year ago
What do you call a circuit with only one path
DanielleElmas [232]
If I'm correct the answer should be a series circuit :) Hopefully this helps you out
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What element has greatest atomic radius from group 3?
stira [4]

Answer:

i think iron

Explanation:

i not sure with my ans

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Please hurry Participants in an informal discussion would most likely
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The answer is A. use casual, friendly conversation.
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3 years ago
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