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
Vlada [557]
3 years ago
5

17. A balloon contains 4.50 X 1022 atoms of helium gas. Calculate the mass of helium in grams.

Chemistry
2 answers:
Rashid [163]3 years ago
4 0

Answer:

1.08 grams

Explanation:

first, we need to find the number of moles

we divide 12.1/22.4=0.54 moles

we multiply the number of moles with the molecular mass 0.54x2=1.08g

castortr0y [4]3 years ago
3 0
I agree with the person on top have a wonderful day :)
You might be interested in
What is an example of a soultion
Marrrta [24]

Answer:

Did you mean solution??

In chemistry, a solution is considered as a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

Eg: sweet tea or coffee (sugar added to solution)

     bleach (sodium hypochlorite dissolved in water)

HOPE IT HELPS :)

3 0
3 years ago
Ice, liquid, and water vapor are the three states of water
UNO [17]
This is true. Solid, Liquid, and Gas.


Hope that helps!!
7 0
2 years ago
Limiting Reactants—————-
denis-greek [22]

Answer:

21.8 grams.

Explanation:

Molar mass data from a modern periodic table:

  • Mg: 24.301;
  • O: 15.999.

How many moles of MgO will be produced if Mg is the limiting reactant?

Number of moles of Mg:

\displaystyle n = \frac{m}{M} = \frac{16.3}{24.301} = 0.670644\;\text{mol}.

The ratio between the coefficient of Mg and that of MgO is 2:2. Two moles of Mg will make two moles of MgO. 0.670644 moles of MgO will be produced if Mg is the limiting reactant.

How many moles of MgO will be produced if O₂ is the limiting reactant?

Number of moles of O₂:

\displaystyle n = \frac{m}{M} = \frac{4.33}{15.999} = 0.270642\;\text{mol}.

The ratio between the coefficient of O₂ and that of MgO is 1:2. One mole of O₂ will make two moles of MgO. 2\times 0.270642 = 0.541284\;\text{mol} of MgO will be produced if O₂ is in excess.

How many moles of MgO will be produced?

0.541284 is smaller than 0.670644. Only 0.541284 moles of MgO will be produced since O₂ will run out before all 16.3 grams of Mg is consumed.

What's the mass of 0.541284 moles of MgO?

Formula mass of MgO:

24.301 + 15.999 = 40.300\;\text{g}\cdot\text{mol}^{-1}.

Mass of 0.541284 moles of MgO:

m = n \cdot M = 0.541284\times 40.300 = 21.8\;\text{g}.

7 0
2 years ago
What is the simplest formula of a compound if a sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z? chemP
Gnoma [55]

Answer:

XY₂Z₄

2.35 mol Z

Explanation:

A sample of the compound contains 0.221 mol X, 0.442 mol Y, and 0.884 mol Z. We can find the simplest formula (empirical formula) by <em>dividing all the numbers of moles by the smallest one</em>.

X: 0.221/0.221 = 1

Y: 0.442/0.221 = 2

Z: 0.884/0.221 = 4

The simplest formula is XY₂Z₄.

The molar ratio of X to Z is 1:4. The moles of Z in a sample that contained 0.588 moles of X is:

0.588 mol X × (4 mol Z/1 mol X) = 2.35 mol Z

6 0
2 years ago
Read 2 more answers
A sample of an unknown liquid has a volume of 24.0 mL and a mass of 6 g. What is its density? Show your work or explain how you
kobusy [5.1K]
The answer would be 0.25 g/mL. 
I determined the density by dividing the mass by the volume which gives you the density. D = mass/volume.
<span>6 g / 24 mL = 0.25 g/mL </span>
8 0
2 years ago
Read 2 more answers
Other questions:
  • Consider the elements in Group 14. Which element has the highest electron affinity? A) Carbon B) Germanium C) Lead D) Silicon
    6·1 answer
  • How would technology affect the population growth rate?
    5·2 answers
  • A gas at STP has a volume of 1.0 liter. If the pressure is doubled and the temperature remains constant, the new volume of the g
    15·1 answer
  • The density of cadmium is 8.65 g/mL, what is the volume of a 33.4 g object made of pure cadmium?
    9·1 answer
  • An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one n
    10·1 answer
  • Which element easily loses one electron to form a positive ion? (AKS 1c/DOK 1)
    13·1 answer
  • Please describe the structure of the atom. How is the atom related to protons, neutrons and
    10·1 answer
  • Chromosomes _____. (Choose all that apply)
    12·1 answer
  • Because rusting is a spontaneous process under standard conditions, which of the following is a correct conclusion about the pro
    13·2 answers
  • Magnesium most common isotope
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!