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How many atoms of zerconium are there in 1 gram of it?
1 answer
We know there are about 6.02 x 10^23 atoms in a mole, so convert the grams to moles and then multiply by Avogadro's number to find the number of atoms.
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the mass of 1 atom of hydrogen is 1.67 * 10^(-24) gram. how much do 25 atoms of hydrogen weigh?
A. 4.175 * 10^(-23) gram B. 4.175
Top answer:
25 * 1.67 * 10^(-24) = 41.75 * 10^-24 = 4.175 * 10^-23 most scientific calculators can easily handle
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The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
a) 1 gram Ne = 20.180 moles = 6.022×10²³
Top answer:
Naturally occurring neon contains three isotopes. Therefore, its atomic mass is an average composed
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the atomic mass of the element niobium (Nb) is 92.906 amu. Which measurement is correct?
A. 1 mole of Nb = 92.906 grams B. 1 gram
Top answer:
A. 1 mole of Nb = 92.906 grams
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a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 10^23
b. How many atoms of
Top answer:
now you have the moles of NH3. then, there are three atoms of H per molecule, so moles of H is
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Example for next four problems:
Compound formula: MgCl2 Element: Mg # of Atoms: 1 Element: Cl # of Atoms: 2 gram formula weight
Top answer:
Element: K # of Atoms: 1 Element: N # of Atoms: 1 Element: O # of Atoms: 3 gram formula weight (g):
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Between which two objects is gravitational attraction the greatest if placed 1 meter apart? 1.0-gram paper clip. 2.5-gram penny.
Top answer:
The gravitational attraction between two objects is determined by their masses and the distance
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B) if you are holding a piece of Silicon that weighs 28.1 gram (atoms mass of Silicon is 28.1) how many silicon atoms are you
Top answer:
moles=mass/atomicmass number atoms= avagradro's number * moles
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Which object will experience the least amount of gravitational attraction toward Earth?(1 point)
Responses a 75-gram calculator a
Top answer:
a 5-gram pencil
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Which object will experience the least amount of gravitational attraction toward Earth?(1 point)
Responses a 75-gram calculator a
Top answer:
a 5-gram pencil
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Which object will experience the least amount of gravitational attraction toward Earth?(1 point)
Responses a 5-gram pencil a
Top answer:
a 40-gram eraser
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