what is the mass in grams?
a) 3.011 x 10^23 atoms F
b)1.50 x 10^23 atoms Mg
c)4.50 x 10^12 atoms Cl
d)8.42 x 10^18 atoms Br
e) 25 atoms w
f) 1 atom Au
can you please explain a and b to me then i'll come back later and see if i did the rest right? Thanks in advance
it needs to be in scientific notation i think.
8.42x10^18
need to far
T its ben 1
33 years!!!
To find the mass in grams, you need to use the concept of molar mass. Molar mass is the mass of one mole of a substance, which is equal to its atomic or molecular weight expressed in grams. The molar mass is usually found on the periodic table.
To calculate the mass in grams, you can use the following steps:
1. Identify the element or compound in question. In case (a), it is atoms of fluorine (F), and in case (b), it is atoms of magnesium (Mg).
2. Determine the molar mass of the element or compound. The molar mass of F is approximately 18.998 g/mol, and the molar mass of Mg is approximately 24.305 g/mol. You can find these values on the periodic table.
3. Convert the given value to moles. The given value in case (a) is 3.011 x 10^23 atoms of F, and in case (b) is 1.50 x 10^23 atoms of Mg.
To convert the number of atoms to moles, divide the given number of atoms by Avogadro's number, which is 6.022 x 10^23 molecules/mol.
So, for case (a):
Number of moles = (3.011 x 10^23) / (6.022 x 10^23)
And for case (b):
Number of moles = (1.50 x 10^23) / (6.022 x 10^23)
4. Calculate the mass in grams by multiplying the number of moles by the molar mass.
So, for case (a):
Mass in grams = (3.011 x 10^23 / 6.022 x 10^23) * 18.998 g/mol
And for case (b):
Mass in grams = (1.50 x 10^23 / 6.022 x 10^23) * 24.305 g/mol
Once you have performed the calculations, you will get the mass of atoms F in grams for case (a) and the mass of atoms Mg in grams for case (b).
1 mol of anything contains 6.02 x 10^23 of those anythings; therefore, 1 mol of F atoms will contain 6.02 x 10^23 atoms of F. And it will have a mass of 19.0 grams (Look up the atomic mass of F on the periodic table.) So,
3.011 x 10^23 atoms x (1 mol atoms/6.02 x 10^23 atoms) x (19.0 g F atoms/1 mol F atoms) = ?? grams F. Note how the units cancel to give grams at the end.
b,c,d are done the same way.