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
abruzzese [7]
4 years ago
8

The half-life of radioactive element krypton-91 is 10 seconds. if 16 grams of krypton-91 are initially present, how many grams a

re present after 10 seconds? after 50 seconds?
Chemistry
1 answer:
earnstyle [38]4 years ago
6 0
10 seconds = 8grams
then just divide by 2 another 4 times...
 = 0.5grams after 50 seconds
You might be interested in
5. Calcium-40 and Calcium-42 both share the same
gayaneshka [121]
They share the same number or protons
6 0
3 years ago
How many moles of hydrogen are in 4.70 moles of C12H22O11
Sphinxa [80]

Answer:

103.4 moles of hydrogen

Explanation:

Given data:

Moles of C₁₂H₂₂O₁₁ = 4.70 mol

Number of moles of hydrogen present = ?

Solution:

one mole of C₁₂H₂₂O₁₁  contain 22 moles of hydrogen. Thus in order to determine total number of moles in 4.70 moles of C₁₂H₂₂O₁₁ we will multiply the 22 moles of hydrogen with 4.70 moles of C₁₂H₂₂O₁₁.

1 mole of C₁₂H₂₂O₁₁ = 22 moles of Hydrogen

4.70  × 22 moles

103.4 moles of hydrogen

8 0
3 years ago
Rock salt is a mixture of salt (sodium chloride) and sand. Describe how you would separate rock salt to obtain salt crystals and
choli [55]

Answer:

pour the rock salt mixture throught a filter made from paper and allow the liquid to filtrate .

Explanation:

Separating Sand and Salt

Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.

6 0
3 years ago
Which of the following describes the sharing of a nonbonding electron pair on a nitrogen molecule with an oxygen atom, resulting
Gala2k [10]
This is coordinate (dative) bonding where the nitrogen atom donates 2 electrons to the oxygen but is still chemically bonded.
5 0
3 years ago
Need help ASAP... The diagram shows a box in the periodic table.. what is the atomic number of the element??​
ad-work [718]
The atomic number is 15
4 0
3 years ago
Other questions:
  • A candy bar has a total mass of 75.0 grams. In a calorimetry experiment, a 1.0-g sample of this candy bar was burned in a calori
    10·1 answer
  • According to the following reaction, how many moles of iron(III) chloride will be formed upon the complete reaction of 26.2 gram
    9·1 answer
  • A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
    5·2 answers
  • What is the effect of temperature and density on the movement of water?
    11·1 answer
  • How does weathering affect the surface area of a rock? Explain your answer.
    10·1 answer
  • What is impossible to do with a hypothesis?
    15·2 answers
  • Please answer the “(fill-in)” ones thank you :)
    5·1 answer
  • What is most responsible for changing the boiling and freezing points of a solvent?
    14·2 answers
  • What happens to chemical bonds during a chemical reaction?
    7·1 answer
  • How to solve chemical equations plss explain​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!