1-
How many grams in 2.5 of CO2?
2- How many moles are in 90 grams of C6H12O6?
3 - How many grams of hydrogen are in 2 moles C3H8
4- Identify the groups and period that each elements belongs
:
Silicon
Barium
Element number 21
Iodine
5 - What is the maximum electron number that can be contained
in following:
A 2s orbital
The 3p subshell
The third shell
A 4d orbital
6 - How many valence electrons are...
a. How many ATOMS of carbon are present in 3.13 moles of carbon
tetrabromide ? ------ atoms of carbon.
b. How many MOLES of bromine are present in 1.60×1021 molecules
of carbon tetrabromide ? ----- moles of bromine.
c. How many ATOMS of sulfur
are present in 3.88 moles of sulfur
dioxide ? ------ atoms of sulfur.
d. How many MOLES of oxygen
are present in 6.72×1022 molecules of
sulfur dioxide ? ------- moles of
oxygen.
e. How many MOLECULES...
1. How many GRAMS of
nitrogen are present in 3.97
moles of dinitrogen tetrafluoride ? grams.
2. How many MOLES of
fluorine are present in 2.72
grams of dinitrogen tetrafluoride ? moles.
How many rotational degrees of freedom are there in a carbon
dioxide (CO2) molecule? Under low pressure, CO2 gas heated up to
high enough temperature to excite its translational, rotational and
vibrational modes, (i) find its specific heats and (ii) compare the
specific heats from (i) and literature values at moderate
temperatures.
1) 1. How many ATOMS of
sulfur are present in 4.30 moles
of sulfur dioxide ?
atoms of sulfur.
2. How many MOLES of
oxygen are present in
1.91×1022 molecules of sulfur
dioxide ?
moles of oxygen.
2) 1. How many MOLECULES of
carbon tetrafluoride are present in
1.45 moles of this compound ?
molecules.
2. How many MOLES of
carbon tetrafluoride are present in
1.07×1023 molecules of this compound
?
moles.
3) 1. How many MOLECULES of
phosphorus triiodide...
Methane, CH4, burns completely in oxygen to yield carbon dioxide
and water. 1. how many grams of carbon dioxide can be formed from
16.0g of methane and 48.0g of oxygen?
2. how much excess reagent will be left unreacted?
3. if only 30.0g of carbon dioxide are formed, what is the
percent yield of the reaction?
1)How many moles of Sr are there in
93.2 grams of Sr?
2)How many grams of Ag are there in
0.692 moles of Ag?
3)How many grams of Ga are there in a sample of
Ga that contains the same number of moles as a
39.1 gram sample of Mg? grams of
Ga