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timofeeve [1]
3 years ago
15

A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is th

Chemistry
1 answer:
Alex787 [66]3 years ago
3 0

Answer:

A

Explanation:

3 days later: 60/2=30

6 days later: 30/2=15

9 days later: 15/2=7.5

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Making observations is the first step in the scientific method. Why don't scientists stop with the first step when creating an e
Ronch [10]
D will be the answer I hope that help good luck I hope. My answer help you
7 0
3 years ago
If 1.0 mole of neon, 2.0 moles of helium, and 3.0 moles of argon are mixed, what is the mole fraction of helium?
alexandr1967 [171]

The mole fraction of helium is 0.33.

The mole fraction can be calculated with the aid of dividing the number of moles of 1 factor of an answer by means of the overall number of moles of all the additives of a solution. it's far noted that the sum of the mole fraction of all the components in the solution should be same to one.

Mole fraction is a unit of attention. within the answer, the relative amount of solute and solvents are measured by the mole fraction and it is represented. The mole fraction is the wide variety of moles of a specific thing within the solution divided by way of the entire wide variety of moles.

Mole fraction represents the quantity of molecules of a selected thing in a combination divided by using the total variety of moles within the given mixture. it is a manner of expressing the concentration of a solution. consequently, the sum of mole fraction of all of the additives is always equal to one.

Mole of neon = 1

mole of helium = 2

mole of argon = 3

Total mole = 1 + 2 + 3 = 6

Mole fraction = mole of helium / total mole

                      =  2 / 6 = 0.33

Learn more about mole fraction here:-brainly.com/question/1601411

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7 0
1 year ago
The particles of a gas inside a balloon are experiencing an increase in the average kinetic energy and the number of collisions
Sever21 [200]

Answer:

1. Higher gas pressure inside the balloon.

Explanation:

An increase in the average kinetic energy and the number of collisions represents increases on gas temperature and pressure inside the ballon. Hence, the answer is 1.

6 0
3 years ago
An atom with six protons and eight neutrons is a(n)___
mylen [45]

Answer:

standard carbon atom

Explanation:

7 0
3 years ago
Read 2 more answers
What is the volume of 1,000 kg of ice? Please explain.
mars1129 [50]

Answer:

Volume of ice is 1.09 m³.

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Mass of ice = 1000 Kg

Volume = ?

Solution:

The density of ice is 919 Kg/m³

d = m/v

v = m/d

v = 1000 Kg / 919 Kg/m³

v = 1.09 m³

6 0
3 years ago
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