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
Ksju [112]
3 years ago
7

Cesium-137 has a half-life of 30 years. You find a sample with 3 g of cesium-137. How much cesium-137 existed in the sample 90 y

ears ago?
Chemistry
1 answer:
Reil [10]3 years ago
5 0

A lot of cesium is how much cesium you would get and stuff

You might be interested in
For a particular reaction, Δ H = 120.5 kJ / mol and Δ S = 758.2 J / ( mol⋅K). Calculate Δ G for this reaction at 298 K. Δ G = kJ
lilavasa [31]

Answer:

ΔG = -105.4 kJ/mol

The system is spontaneous as written.

Explanation:

Step 1: Determine Gibbs free energy of reaction (ΔG)

We use the following expression.

ΔG = ΔH - T × ΔS

where,

  • ΔH: enthalpy of reaction
  • T: absolute temperature
  • ΔS: entropy of reaction

ΔG = ΔH - T × ΔS

ΔG = 120.5 kJ/mol - 298 K × 0.7582 kJ/mol.K

ΔG = -105.4 kJ/mol

Step 2: Determine the spontaneity of the system.

Since ΔG < 0, the system is spontaneous as written.

6 0
3 years ago
The standard metric units of density are:<br> kg/N<br> g/cm3<br> kg/cm3<br> g/L
Anon25 [30]

Answer;

= g/cm^3

Explanation;

-Density is the mass per volume of a substance, or the weight per volume of an object. The Metric System is a type of system of measuring that uses only one root word for each basic dimension, such as, -gram for mass or -meter for distance.

-Metric system densities are usually in the units of mass per volume, such as g/cm^3 (gram per cubic centimeter). Where grams represents the units of mass and cm^3 represents the volume.

8 0
3 years ago
Read 2 more answers
How many valence electrons does B (boron) have?<br> A. 13<br> B. 5<br> C. 10<br> D. 3
pshichka [43]

Answer:

Boron has 3 valence electrons

8 0
3 years ago
10.0 mL of 3.0 M sulfuric acid has been added to 50.0 mL of water.
Cloud [144]

Answer:

the new concentration is 0.60M

Explanation:

The computation of the new concentration is shown below;

We know that

M1V1=M2V2

(3.0M) (10.0 mL) = M2 (50.0mL)

30 = M2 (50.0mL)

So, M2 = 0.60 M

Hence, the new concentration is 0.60M

The same is considered and relevant

3 0
3 years ago
How many moles are in 1.2x10^3 grams of ammonia(NH3) ?
miskamm [114]

Answer : The number of moles present in ammonia is, 70.459 moles.

Solution : Given,

Mass of ammonia = 1.2\times 10^3g

Molar mass of ammonia = 17.031 g/mole

Formula used :

\text{Moles of }NH_3=\frac{\text{ given mass of }NH_3}{\text{ molar mass of }NH_3}

\text{Moles of }NH_3=\frac{1.2\times 10^3g}{17.031g/mole}=70.459moles

Therefore, the number of moles present in ammonia is, 70.459 moles.

5 0
3 years ago
Read 2 more answers
Other questions:
  • The substance nitrogen has the following properties: normal melting point: 63.2 K normal boiling point: 77.4 K triple point: 0.1
    6·1 answer
  • How many atoms are in 52.3 g of calcium ?
    10·1 answer
  • Why does fullerene has a lower melting point than diamond?
    8·1 answer
  • Why is it possible to safely drink a solution that contains a 50:50 mixture of equal concentrations of a strong acid and a stron
    11·1 answer
  • How is gas different from a liquid and a solid
    6·2 answers
  • Why do scientists need a universal system to classify organisms?
    15·1 answer
  • The graph below shows how the temperature and volume of a gas vary when
    6·1 answer
  • The function of the cell wall is to
    5·2 answers
  • A 10.00 mL sample of a 1.07 M solution of potassium hydrogen phthalate (KHP, formula mass = 204.22 g/mol) is diluted to 250.0 mL
    7·1 answer
  • The name of the chemical reaction
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!