A. How many moles of copper equal 8.00 × 109 copper atoms?
b. How many moles of calcium equal 102.5 g calcium?
c. How many atoms of lead are present in 5.04 g lead?
d. How many aluminum atoms are present in 2.85 moles of aluminum?
e. What is the mass in grams of 1.08 × 103 moles of fluorine gas?
f. How many molecules of benzene (C6H6) are present in 0.584 g of benzene?
g. What is the mass of 5.09 × 109 atoms of hydrogen gas?
h. How many calcium atoms are present in 0.45 mol Ca3PO4?
Solved
Show answers
More tips
- A Auto and Moto Mastering One-Movement Parking: All You Need to Know...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- P Photography and Videography How to Choose the Perfect Photo Paper for Your Images?...
- C Computers and Internet How to Choose an Uninterruptible Power Supply (UPS) for Your Computer: Expert Tips...
- S Science and Technology How to choose a home theater system?...
- A Auto and Moto How to Choose a Car Wash? Tips and Recommendations...
- A Animals and plants How ants survive winter: exploring the secrets of their winter life...
- C Construction and repair How to Choose the Best Underfloor Heating?...
- S Sport When is the Champions League final?...
- S Sport When and Where Will the 2014 World Cup be Held?...
Answers on questions: Chemistry
- C Chemistry About 40 different substances called organophosphorus compounds are registered in the united states as insecticides. they are considered less damaging to the environment than...
- C Chemistry What mass of iron is required to replace over from 8.00 g of silver nitrate dissolved in water...
- C Chemistry Which ion in the ground state has the same electron configuration as an atom of argon in the ground state...
- C Chemistry Low frequency red light is used in the dark rooms because it does not expose the film.this is because the red light had a low ?...
- C Chemistry I need the answer asap anyone know ??...
- C Chemistry Isotope Percent Abundance Relative Mass Carbon-35 75.77 34.9689 Carbon-37 24.23 36.9659 Find the average mass of the isotope. Answer in 4 significant figures...
- C Chemistry A baby crawfish has a long tail. Its mother has a long tail while its father has a short tail. Which of these statements explains why the baby has a long tail?...
- C Chemistry Question Normal 5 m/s Niels 7 m/s Albert -- 9 m/s Max Which penguin will require the greatest force to stop moving? ©2021 Illuminate Education, Inc. peqt niels albert or max...
- C Chemistry Review the electron configurations of the elements in group 2, moving down from beryllium (Be) to radium (Ra). What do you observe?...
- C Chemistry Figure 10-3 Using Tables and Graphs If an initial sample contains 48 g of thorium-234, how much of the product isotope (not the thorium) will be present after 72.3 days?...
Ответ:
Explanation:
a ) one mole = 6.02 x 10²³ atoms
no of moles in given no of atoms
= 8 x 10⁹ / 6.02 x 10²³
= 1.329 x 10⁻¹⁴ moles .
b ) one mole of calcium = 40 gram
102 .5 g calcium
= 102 .5 / 40 moles
= 2.5625 moles
c )
no of moles in 5.04 g lead = 5.04 / 207
= 2.4347 x 10⁻² moles
= 2.4347 x 10⁻²x 6.02 x 10²³ no of atoms of lead
= 14.6568 x 10²¹ no of atoms .
d)
one mole = 6.02 x 10²³ atoms
2.85 mole = 17.157 x 10²³ atoms .
e )
moles of fluorine gas = 1.08 x 10³ / 6.02 x 10²³
= .1794 x 10⁻²⁰ moles
mass in grams = .1794 x 10⁻²⁰ x 38
= 6.8172 x 10⁻²⁰ grams
f )
no of moles in .584 g of benzene = .584 / 78
= 7.487 x 10⁻³ moles
no of molecules = 6.02 x 10²³ x 7.487 x 10⁻³
= 45.07 x 10²⁰ molecules .
g )
moles of atoms = 5.09 x 10⁹ / 6.02 x 10²³
= .8455 x 10⁻¹⁴ moles
mass in gram = .8455 x 10⁻¹⁴ x 1
= .8455 x 10⁻¹⁴ g
h )
.45 moles of Ca₃PO₄ = .45 x 6.02 x 10²³ molecules
= 2.709 x 10²³ molecules of Ca₃PO₄
no of atoms of Ca = 3 x 2.709 x 10²³
= 8.127 x 10²³ atoms of Ca .
Ответ:
0.30 mol
to precipitate all of the
ions.
The first step would be to write out the equation as follows:-
Now we need to balance the reaction:
So from the above balanced reaction, we can see that for every mole of NaCl and every mole of
, we need 3 moles of
to precipitate all of the
ions.
So, 0.10 mol of KCl and 0.10mol of
, we need a total of 0.30mol to precipitate all of the
ions.
To know more about:-
link