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kondor19780726 [428]
3 years ago
12

Uranium has 146 neutrons; therefore its mass number is which of the following?

Chemistry
2 answers:
Vilka [71]3 years ago
5 0
Its <span>234or238  hope dis helped</span>
Artemon [7]3 years ago
3 0
238.0289 (make sure you like my comment thank u )
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A student calculates that the volume of his textbook is 991.880 cm3. what is the volume written with 3 significant figures?
k0ka [10]

The volume of the textbook calculated by the student written to 3 significant figures is 992cm³

  • According to this question, a student calculates the volume of his textbook and arrived at an answer of 991.880 cm³.

  • To round up this digit to 3 significant figures, which means that only 3 significant numbers should appear in the answer.

  • To do this, the number after the third number is 8, which means we can round up the value of 1 to 2. Hence, the volume of the textbook calculated by the student is 992cm³ in 3 s.f.

Learn more at: brainly.com/question/16563962?referrer=searchResults

7 0
3 years ago
What is the osmolarity of .00001 grams (0.1 mg%) of ethanol (does not dissociate) in one liter?
MrMuchimi

Explanation:

As it is known that non-electrolytes do not dissociate. Therefore, molarity of such a solution is equal to the osmolarity of solution.

As, molar mass of ethanol = 46.07 g/mol

Therefore, no. of moles of ethanol will be calculated as follows.

               No. of moles = \frac{mass}{\text{molar mass}}

                                     = \frac{0.00001 g}{46.07 g/mol}

                                     = 2.17 \times 10^{-7} mol

As, molarity is moles of solute in liter of solution. Hence, molarity of ethanol is as follows.

                           Molarity = \frac{\text{no. of moles}}{volume}

                                          = \frac{2.17 \times 10^{-7} mol}{1 L}

                                          = 2.17 \times 10^{-7} mol/L

Since, for the given solution Molarity = osmolarity

Thus, we can conclude that osmolarity of .00001 grams (0.1 mg%) of ethanol  in 1 L is 2.17 \times 10^{-7} osmol/L.

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Why are mercury thermometers rarely used in the laboratory?
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Because it is one of the strongest chemicals and it is very dangerous.
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Which statement describes the moment magnitude scale?
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It shows only the strength of seismic waves that were produced.

Explanation:

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What is the mass number of an oxygen isotope that has nine neutrons.
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