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...
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
a) How many moles of Cu are there in
35.7 grams of Cu?
b) How many MOLES of dinitrogen
tetrafluoride are present in 3.33 grams
of this compound ?
c) How many ATOMS of nitrogen
are present in 3.29 grams of dinitrogen
tetrafluoride ? atoms of
nitrogen .
d) How many GRAMS of fluorine are
present in 6.41×1022 molecules of
dinitrogen tetrafluoride ?
e) How many GRAMS of dinitrogen
tetrafluoride are present in 1.98 moles
of this compound ?
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.
9. How many moles of NO2 are contained in 45.1g of NO2?
10. How many grams of Al are reuired to react completely with
4.30g of HCi according to the following equation? 2Al +6HCl ->
2AlCl3 + 3H2
11. Concentrated sodium hydoxide solution contains 50.0% by mass
NaOH an has density of 1.52g/mL. What volume of this solution in
mL. required to abotain 1.35g of N6OH?
How many GRAMS of carbon are present in 4.00 moles of carbon
dioxide, CO2?
How many MOLES of oxygen are present in 3.11 grams of carbon
dioxide?
How many GRAMS of oxygen are present in 9.82×10^22 molecules of
tetraphosphorus decaoxide?