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katrin2010 [14]
2 years ago
13

Which of the following always changes when a substance undergoes a chemical change?

Chemistry
2 answers:
Ronch [10]2 years ago
8 0

Answer:

C

Explanation:

All chemical reactions will show a change in color.

Elenna [48]2 years ago
7 0

Answer:

C. Color of the substance.

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Determine the mass of each sample 1.55 kmol sulfur trioxide
xxMikexx [17]

Explanation:

Given parameters:

Number of moles of the sulfur trioxide = 1.55kmol = 1.55 x 10³mole

Unknown:

Mass of the sulfur trioxide = ?

Solution:

To solve for the mass of the sample of sulfur trioxide:

  •  Find the molar mass of the compound i.e SO₃

          atomic mass of S = 32g

                                    O = 16g

              molar mass = 32 + 3(16) = 80g/mol

  • Use the formula below:

           mass of SO₃ = number of moles x molar mass

           mass of SO₃ =  1.55 x 10³ x 80 = 124000g or 124kg

Learn more:

mole calculation  brainly.com/question/13064292

#learnwithBrainly

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