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
PolarNik [594]
3 years ago
7

What is the halflife of a radioisotope if a 20-g sample becomes 10g after 16 hours

Chemistry
1 answer:
ohaa [14]3 years ago
5 0

Answer:

T½ = 16hours

Explanation:

Final mass (N) = 10g

Initial mass (No) = 20g

Time (t) = 16hours

T½ = ?

T½ = In2 / λ

But λ = ?

In(N/No) = -λt

In(10/20) = -(λ * 16)

In(0.5) = -16λ

-0.693 = -16λ

λ = 0.693 / 16

λ = 0.0433

Note : λ is known as the disintegration constant

T½ = In2 / λ

T½ = 0.693 / 0.0433

T½ = 16hours

The half-life of the sample is 16hours

You might be interested in
What are the variables in Gay-Lussac’s law?
labwork [276]
This law<span> states that the pressure of a given amount of </span>gas<span> held at constant volume is directly proportional to the Kelvin temperature. Therefore, the variables are pressure and temperature. Hope this answers the question. Have a nice day.</span>
6 0
3 years ago
How are all atoms similar?
attashe74 [19]

Answer:

A. They can not be divided.

Thank you.

BY GERALD GREAT.

5 0
3 years ago
What is the concentration of a solution of a 40.0 g of NaOH in 2.5 L of solution?
RoseWind [281]

Answer: 0.4M

Explanation:

Given that,

Amount of moles of NaOH (n) = ?

Mass of NaOH in grams = 40.0g

For molar mass of NaOH, use the atomic masses: Na = 23g; O = 16g; H = 1g

NaOH = (23g + 16g + 1g)

= 40g/mol

Since, n = mass in grams / molar mass

n = 40.0g / 40.0g/mol

n = 1 mole

Volume of NaOH solution (v) = 2.5 L

Concentration of NaOH solution (c) = ?

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

c = n / v

c = 1 mole / 2.5 L

c = 0.4 mol/L (Concentration in mol/L is the same as Molarity, M)

Thus, the concentration of a solution of a 40.0 g of NaOH in 2.5 L of solution is 0.4 mol/L or 0.4M

7 0
3 years ago
CCC Structure and Function Why is the arrangement of the constituent atoms or
ozzi

Since the atoms or molecules in a solid do not translate hence, the structures of solids usually described in terms of the positions  of the constituent atoms rather than their motion.

<h3>States of matter</h3>

There are three state of matter which are;

  • Solid
  • Liquid
  • Gas

In a solid, atoms or molecules retain their positions and do not translate, hence, the structure of atoms or molecules are most important in determining the structure of a solid.

Also, the fact that the atoms or  molecules in a solid can only vibrate or rotate explains why the structures of solids usually described in terms of the positions  of the constituent atoms rather than their motion.

Learn more about the states of matter: brainly.com/question/9402776

8 0
3 years ago
In which process are glucose and oxygen the reactants?
Alenkasestr [34]
The answer is B. Cellular Respiration, for sure.
7 0
4 years ago
Read 2 more answers
Other questions:
  • Will bromine react with sodium? Explain your answer.
    6·1 answer
  • The standard lab thermometer in a high school science lab contains
    12·2 answers
  • What is the formula for hyposulfurous acid?
    13·1 answer
  • What is the balanced molecular equation for the reaction between nitric acid and calcium hydroxide?
    8·1 answer
  • 2LiClO+KHSO - Li2SO4 + Cl2 + KOOH
    7·1 answer
  • A sodium atom has 11 protons and 12 neutrons. What is the mass number of this sodium atom?​
    5·1 answer
  • What is the definition of the molar mass of an element or compound?
    14·1 answer
  • Measure that affects the thermal energy of matter but not it's temperature. ​
    10·1 answer
  • Which elements above will form cations? List them below.
    8·1 answer
  • A pure sample of a monoprotic acid is dissolved in water. the sample is titrated with sodium hydroxide solution. at the point wh
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!