Percent Composition
What percent of lithium is in lithium chloride?
16.73%
What is the empirical formula if the the molecular formula is C4H16O8 ?
CH4O2
How many moles are in 2.89 x 1025 atoms?
48.0 moles
Is KNO3 soluble or insoluble?
soluble
(4.918+2.83)/(9.230-1.569)
1.01
What percent oxygen is in magnesium nitrate?
64.72%
If a compound has an empirical formula of C3H5O, what is the molecular formula with a mass of 171 g
C9H15O3
How many moles of O in C2H5O3 ?
3 mole O
Is calcium sulfate soluble or insoluble?
insoluble
Convert 8.92 x 1015 ng to kg
8920 kg
212g of MgCl2 ... How many grams of Cl if MgCl2 is 74.5% Cl by mass?
160. g
Aspirin contains 60% carbon, 4.48% hydrogen and 35.5% oxygen. What is the empirical formula?
C9H8O4
How many grams are in 4.32 moles of sodium hydroxide?
173 g
Determine the products, which is solid?
Na2SO4 (aq) + CaI2 (aq) →
CaSO4 (s) + 2 NaI (aq)
Balance the equation
___CO2 + ___H2O → ___C6H12O6 + ___O2
6, 6, 1, 6
91g of CO2, how many grams of C?
24.8g
A compound is found to be 40.0% carbon, 6.7% hydrogen and 53.5% oxygen. Is molecular mass is 60. g/mol. What is its molecular formula?
C2H4O2
How many molecules are there in 40.67 g of NaCl?
4.191 x 1023 molecules
Finish the reaction and find the net ionic equation
AgNO3 (aq) + K2S (aq) -->
2 Ag+ (aq) + S-2 (aq) --> Ag2S (s)
What is the atomic symbol of potassium with 17 neutrons?
K3619
If you have 65.3 g of lithium nitrite, how many grams of oxygen are in that?
39.5 g
A compound contains 30.4% nitrogen and 69.6% oxygen. The molar mass of the compound is 184 g/mol. What is the molecular formula of the compound?
N4O8
How many moles of CaBr2 are in 5.87 x 1024 atoms of Br ?
4.87 moles CaBr2
Find the net ionic equation. Make sure to balance first.
Na2CO3 (aq) + Ba(NO3)2 (aq) --> NaNO3 + BaCO3
Ba2+ (aq) + CO32- (aq) --> BaCO3 (s)
Convert 82 mph to m/s
1 mile = 5280 ft
1 foot - .3 meter
36 m/s