Question

For
an aluminum with mass 1.30g

1. What’s the number of aluminum atoms

2. What’s the Avogadro’s Number

Answer #1

what mass of Aluminum contains the same number of
atoms as 3.0g Pb?

Calculate the number of atoms per unit cell in
(a) Aluminum (FCC)
(b) Alpha-iron (BCC)

Write complete symbols, including mass number and atomic number,
for atoms with the following characteristics. 1) Contains 28
protons and 30 neutrons. 2) Contains 22 protons and 21 neutrons. 3)
Contains 15 electrons and 19 neutrons. 4) Oxygen atom with 10
neutrons. 5) Chromium atom with a mass number of 54

1- How many moles of N2O5 contain the same number of nitrogen
atoms as exactly 19 mol of NO2?
2- How many grams are contained in 0.900 mol of calcium
phosphate, Ca3 (PO4)2?
3- Ga
Number of electrons =_______ electrons
Number of protons = _________protons
4- element number 79
Number of electrons = _____electrons
Number of protons = ______protons
5- What are the symbol and name for an element whose average
atoms have a mass that is 59.6% of the...

You have 5.46 moles of Aluminum. How many atoms of Aluminum is
that?

1)Calculate the number of molecules of the compound and the
number of atoms of each of the elements in 3.98 moles of SO3 . ?
molecules, ? atoms of S, ? atoms of O 2) Calculate the number of
molecules of the compound and the number of atoms of each of the
elements in 3.35 moles of P4O12. ? molecules, ?atoms of P, ? atoms
of O

1.
Calculate the formula mass of calcium iodite Ca(IO2)2 in amu.
2. Calculate the number of atoms in a 2.93x10^23g sample of
silicon.
3. How many atoms are in 0.920g of P2O5?
4. What is the mass (in grams) of 9.92x10^24 molecules of
methanol (CH3OH)?

The density of aluminum metal is 2.70g/mL, the atomic mass
26.98g/mol, the radius of an aluminum atom is 143 picometer (1
picometer = 1x10^-12m) and the packing density is 74% of theory. a)
How many layers of aluminum atoms (not unit cells!) made up the
sample of aluminum foil for which we provided the data. b) Briefly
outline your strategy for solving this problem (what you computed
and why/how, how you used this result to comput what parameter
next).

1. Calculate the number of C atoms in 0.927 mole of C.
2. Calculate the number of SO2 molecules in 7.39 moles of
SO2.
3. Calculate the moles of Fe in 8.62x1022 atoms of Fe.
4. Calculate the moles of C2H6O in 4.82x1024 molecules of
C2H6O.

In 84.7g magnesium hypophosphite:
1. What is the number of total number of atoms?
2. How many moles of oxygen?

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