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inn [45]
2 years ago
8

An atom has 13 protons and 14 neutrons. what is its mass number?

Chemistry
1 answer:
Artemon [7]2 years ago
5 0

27 is its mass number

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If you have 1.1 moles of magnesium nitrate then how many grams is that
marysya [2.9K]

Answer: 162.8 grams

Explanation:

Magnesium nitrate has a chemical formula of Mg(NO3)2.

Given that:

Number of moles of Mg(NO3)2 = 1.1 moles

Mass in grams of Mg(NO3)2 = ?

For Molar mass of Mg(NO3)2, use atomic mass of magnesium = 24g, nitrogen = 14g, oxygen = 16g

Mg(NO3)2 = 24g + (14g + 16gx3) x 2

= 24g + (14g + 48g) x 2

= 24g + (62g) x 2

= 24g + 124g

= 148g/mol

Now, apply the formula:

Number of moles = Mass in grams / molar mass

1.1 moles = Mass / 148g/mol

Mass = 1.1 moles x 148g/mol

Mass = 162.8 grams

Thus, there are 162.8 grams of magnesium nitrate.

3 0
3 years ago
A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755.0 mmHg.
sukhopar [10]

Answer:

737.5mmHg

Explanation:

7 0
3 years ago
The discharge of phosphate in detergents to the environment has led to imbalances in the life cycle of freshwater lakes. A chemi
alina1380 [7]
<h3>What is spectrometric method?</h3>
  • A technique called spectrophotometry uses light intensity measurements as a beam of light travels through a sample solution to determine how much a chemical compound absorbs light.
  • Every chemical either absorbs or transmits light across a specific spectrum of wavelengths, according to the fundamental principle.
  • There are two main techniques used among the various forms of spectrophotometry:
  • ultraviolet-visible range spectrophotometry, which examines the reflectance of certain spectra,
  • and absorption spectrophotometry, which examines the absorption of radiation and particular spectra of light.
  • Applications of spectrophotometry are useful for determining how well gases, liquids, and solids transmit, reflect, and absorb light.

Learn more about spectrometric method here:

brainly.com/question/18339003

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3 0
1 year ago
What is<br>mole used for​
nordsb [41]

Answer:

What is mole used for?

Explanation:

The mole is widely used in chemistry as a convenient way to express amounts of reactants and products of chemical reactions.

SI base units: Base unit (Dimensionless)

Symbol: mol  

Unit of: Amount of substance

Unit system: SI base unit

8 0
3 years ago
A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solutio
brilliants [131]

Explanation:

The given data is as follows.

          Concentration of standard NaOH solution = 0.1922 M

Let the original acid solution concentration be x.

                        M_{1}V_{1} = M_{2}V_{2}

                        x \times 25 = 250 \times M_{2}

                         M_{2} = \frac{x \times 25}{250}

                                     = 0.1 x M

V_{2} = 10.00 mL (given)

The reaction equation is as follows.

             2NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + 2H_{2}O

   Concentration × Volume of H_{2}SO_{4} = Concentration × Volume of NaOH

           \frac{M_{2}V_{2}}{n_{2}} = \frac{M_{3}V_{3}}{n_{3}}

     \frac{0.1 x \times 10 ml}{1} = \frac{0.1922 M \times 13.68 ml}{2}

                  x = 1.314 M

Therefore, we can conclude that the concentration of the original sulfuric acid solution is 1.314 M.

7 0
3 years ago
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