Chemistry 3a test 2

What is the molar mass of aluminum sulfate?

342.2 g/mol

When an aluminum atom reacts so as to attain a noble gas electron configuration

1s2 2s2 2p6

one mole of ammonium nitrate contains

2 moles of nitrogen

How many moles of carbon are in 3.5 moles of calcium carbonate?

3.5 1 mole of CaCO3 contains one mole of Calcium, one mole of Carbon, and 3 moles of Oxygen. the subscripts indicate the number of moles. so if you have 3.5 moles of CaCO3, then you also have 3.5 moles of C

One mole of potassium sulfate contains:

4 moles oxygen

The mass of one mole of carbon dioxide is ________ g.

44.01

One mole of ammonium nitrite contains:

4moles hydrogen 2 moles of oxygen 2 moles of nitrogen

How many atoms are in 5.80 moles of Helium?

5.80 mol He * 6.022*10^23 atoms He/ 1 mol He. This cancels out moles, leaving 3.49*10^24 atoms He.

How many molecules of sulfur trioxide are in 78.0 grams?

5.87x10^(23) Molar mass SO3 = 32.066+(15.99*3) = 80.036g/mol 78.0/80.036*6.022*10^23 = 5.86*10^23 molecules.

One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms?

9

Calculate the molar mass of ammonium carbonate.

96.09 g/mol

molar mass of calcium nitrate

Calcium Nitrate is Ca(NO3)2. = (1 x Ca40) + (2 x N14) + (6 x O16) = 164grams per mole (164g/mol).

The ground state is when an electron in an atom is excited into the lowest possible vacant orbital.

False

The higher the principal quantum number, the lower the orbital energy.

False

The possible values for the principal quantum numbers are: n = 0, 1, 2, 3, 4.

False

The subshells s, p, d, and f all have the same energy as long as they are in the same principal shell.

False

Which of the following neutral elements has the same electron configuration as the bromide ion, Br−?

Krypton

one mole of oxygen has mass of ___ g

When you are discussing oxygen as the free, uncombined element, then you are discussing oxygen gas, the formula of which is O2 and the molecular weight of which is 32. (which, as you well know, comes from 16 x 2).

How many moles of fluorine are in 3.2 moles of xenon hexafluoride?

XeF6 is Xenon hexafluoride.... 6 atoms F per 1 molecule XeF6.. right? 6 moles F per 1 mole XeF6 so that... 3.2 moles XeF6 x (6 mole F / 1 mole XeF6) = 19.2 moles F

The chemical formula CuBr2 indicates that this compound is composed of 1 gram of copper and 2 grams of bromine.

false

The chemical formula clearly indicates the relationship between the mass of each element in the formula.

false

How many atoms are in 1.50 moles of fluorine gas?

fluorine is a diatomic molecule so multiply by 2. (2)(1.50 mol)(6.02x10^23 atoms/mol) = 1.81x10^24 atoms

Mass is used as a method of counting atoms.

true

One mole of lead(II) nitrate contains six moles of oxygen atoms.

true