1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Aneli [31]
3 years ago
15

An isotope of yttrium has 39 protons and 59 neutrons. what is the atomic mass of that isotope?

Chemistry
1 answer:
Charra [1.4K]3 years ago
8 0
We can define atomic mass the total of number of protons and number of neutrons in an atom or isotope.
<span>So when an isotope of yttrium has 39 protons and 59 neutrons, its atomic mass is equal to;
number of protons + number of neutrons = 39 + 59 = 98</span>
You might be interested in
HELP ASAS 15 POINTS
kramer

Answer:

liquid will be evaporated while solid remains

3 0
3 years ago
Which object would best be identified by a periodic Doppler shift in a star's spectrum along with a dip in the stars light inten
IgorLugansk [536]
The answer would be a planet<span>. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.</span>
5 0
3 years ago
The most penetrating neclear radiation is
Phoenix [80]
Radioactive is the most penetrating nuclear radiation
3 0
3 years ago
Suppose 0.035 moles of HCl is dissolved in enough water to produce 750 mL of solution. What is the pH
zhuklara [117]

Answer:

pH = 1.33

Explanation:

Because HCl is a strong acid, each mole of HCl will completely dissociate into H⁺ and Cl⁻ species.

Now we calculate the molar concentration (molarity) of H⁺:

  • Molarity = moles / volume

(750 mL ⇒ 750 / 1000 = 0.750 L)

  • Molarity = 0.035 moles / 0.750 L
  • Molarity = 0.0467 M

Then we calculate the pH of the solution:

  • pH = -log [H⁺]
  • pH = -log (0.0467 M)
  • pH = 1.33
5 0
3 years ago
Look at the following enthalpy diagram. Select all that apply.
Drupady [299]

Answer:

Option 2 and 4 are correct

Explanation:

The reactants in the attached image have more enthalpy and hence less stability as they are more reactive. Thus, Product is more stable than the reactants.

This is an addition reaction in which two reactants add up to form the product.

Very less activation energy is required as the reactants themselves are unstable, possess high energy and hence are very reactive.

Reactants have more energy than the products.  

5 0
3 years ago
Other questions:
  • Solid NH4HS is introduced into an evacuated flask at 24 ∘C. The following reaction takes place: NH4HS(s)⇌NH3(g)+H2S(g) At equili
    14·1 answer
  • Be sure to answer all parts. part 1 out of 4 how many nucleophilic centers are present in methanol (ch3oh)?
    11·2 answers
  • A gas at 155 kilopascals and 25 °c has an initial volume of 1 liter the pressure of the gas increases to 605 kilopascals as the
    7·1 answer
  • the coldest temperature ever recorded in Virginia was 3 degrees below zero how would you represent this temperature as an intege
    12·2 answers
  • Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowl
    5·2 answers
  • WHAT DID YOU OBSERVE HAPPENED WHEN AN S-WAVE TRAVELED INTO A LIQUID?
    9·1 answer
  • Which of the following best describes a single-replacement reaction?
    8·2 answers
  • Look at picture to understand
    6·2 answers
  • The volume of a gas at 2.0 atm is 3.0 L. What is the volume of the gas at 1.5 atm at the same temperature?
    15·1 answer
  • Which nuclear reactor unit had core damage first? How do you know?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!