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
olga55 [171]
4 years ago
13

boron has two naturally occurring isotopes: boron -10 (abundance = 19.8% , mass = 10.013 amu) boron -11 (abundance = 80.2%, mass

= 11.009 amu) Calculate th eatomic mass of boron
Chemistry
1 answer:
Mariulka [41]4 years ago
6 0

Explanation:

eam=%abudance×mass+%abudance×mass

eam=19.8%×10.013/100+80.2%×11.009/100

eam=198.2574/100+882.9218/100

eam=1081.1792/100

eam=10.811792

eam=10.812

You might be interested in
According to the storage ladder protocol, raw meat should be stored on shelves based on its? A.Minimum internal cooking temperat
VLD [36.1K]

Answer:

D.Maximum internal cooking temperature

Explanation:

According to the Storage Ladder Protocol, food storage in refrigerator should have a proper rules to store them. On the top most shelf, Prepared foods should be kept. On the second shelf, Fruits and Vegetable are kept. Fish and Sea foods are kept on the third shelf. The fourth shelf is reserved for the Beef and Porks. The next shelf is for Ground Meat. The last shelf is for Poultry items. So, this proves that the Ground Beef should be stored above the Chicken. A diagram is attached below to explain the storage order in a more appropriate manner.

7 0
3 years ago
Read 2 more answers
Since this reaction takes place in acidic solution, H2O(l) and H+(aq) will be involved in the reaction. Places for these species
maxonik [38]

Answer:

The balanced equation is given below:

SO4^2−(aq)+ Sn^2+(aq) + 4H^+(aq) → H2SO3(aq)+ Sn^4+(aq) + H2O(l)

The coefficients of the reactants are: 1, 1, 4

The coefficients of the products are: 1, 1, 1

Explanation:

Step 1:

The equation for the reaction. This is given below:

SO4^2−(aq)+ Sn^2+(aq) + –––→ H2SO3(aq)+ Sn^4+(aq) + –––

Step 2:

Inclusion of H+ and H2O into the equation. This is illustrated below:

SO4^2−(aq)+ Sn^2+(aq) + H^+(aq) → H2SO3(aq)+ Sn^4+(aq) + H2O(l)

Step 3:

Balancing the equation.

SO4^2−(aq)+ Sn^2+(aq) + H^+(aq) → H2SO3(aq)+ Sn^4+(aq) + H2O(l)

The above equation can be balanced as follow:

There are total 4 atoms of H on the right side and 1 atom on the left side. It can be balance by putting 4 in front of H^+ as shown below:

SO4^2−(aq)+ Sn^2+(aq) + 4H^+(aq) → H2SO3(aq)+ Sn^4+(aq) + H2O(l)

Now the equation is balanced.

The coefficients of the reactants are: 1, 1, 4

The coefficients of the products are: 1, 1, 1

5 0
3 years ago
What is the final pH of a solution obtained by mixing 300 ml of 0.4 M NH3 with 175 ml of 0.3 M HCl? (Kb = 1.8 x 10-5) Show all o
MariettaO [177]

Answer:

pH of the final solution = 9.15

Explanation:

Equation of the reaction: HCl + NH₃ ----> NH₄Cl

Number of moles of  NH₃ = molarity * volume (L)

= 0.4 M * (300/1000) * 1 L =  0.12 moles

Number of moles of HCl =  molarity * volume (L)

= 0.3 M * (175/1000) * 1 L = 0.0525 moles

Since all he acid is used up in the reaction, number of moles of acid used up equals number of moles of NH₄Cl produced

Number moles of NH₄Cl produced =  0.0525 moles

Number of moles of base left unreacted =  0.12 - 0.0525 = 0.0675

pOH = pKb + log([salt]/[base])

pKb = -logKb

pOH = -log (1.8 * 10⁻⁵) + log (0.0525/0.06755)

pOh = 4.744 + 0.109

pOH = 4.853

pH = 14 - pOH

pH = 14 - 4.853

pH = 9.15

Therefore, pH of the final solution = 9.15

3 0
3 years ago
What is the density of an object that has a mass of 149. 8 g and displaces 12. 1 ml of water when placed in a graduated cylinder
kozerog [31]

Answer:

<h2>12.38 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

d =  \frac{m}{v}  \\

m is the mass

v is the volume

From the question

m = 149.8 g

v = 12.1 mL

We have

d =  \frac{149.8}{12.1}  = 12.380165... \\

We have the final answer as

<h3>12.38 g/mL</h3>

Hope this helps you

4 0
2 years ago
It takes Serina 0.25 hours to drive to school. Her route is 16 meters long. What is
Yakvenalex [24]

Answer:

60 (1 hour) × 0.25 = 15 minutes

15 ÷ 16 = 0.9375 meters per minute

5 0
4 years ago
Other questions:
  • Atom A emits mainly X rays when it is excited. Atom B emits mainly gamma rays. Which emission corresponds to a transition betwee
    5·2 answers
  • Which of the following is NOT a characteristic of most metals?
    12·2 answers
  • Please help will mark Brainly
    6·1 answer
  • Chemistry and physics are a branch of what science?
    13·1 answer
  • What is the Lewis structure for CH2NO2H
    12·1 answer
  • If the volume of an object increases but the mass stays the same, which will happen to the density?
    6·2 answers
  • Be sure to answer all parts. Ammonia is a principal nitrogen fertilizer. It is prepared by the reaction between hydrogen and nit
    11·1 answer
  • Which sample contains a total of 6.0 x 1023 particles?
    7·1 answer
  • 1. Which pair of elements will form an IONIC bond?
    6·1 answer
  • What portion of the volume of each atom or ion on the face of a unit cell is actually within the unit cell
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!