1 (because there is no decimals, the zeros after the 5 are NOT significant)
100
How many atoms are there in 25 amus of Hydrogen?
25
100
How many moles are there in 14.01 g of Nitrogen?
1
100
What is the empirical formula of H2O4?
H20
100
H2 + O2 --> H2O
2H2 + O2 --> 2H2O
200
Express .00005947 in scientific notation.
5.947 X 10^-5
200
What is the molar mass for CuCl
63.55 + 35.45 = 99.3
200
How many grams are in 43 moles of argon?
1717.85
200
What is the empirical formula of C80 H120 O5
What is C16 H24 0
200
Fe + Cl2 ---> FeCl3
2Fe + 3Cl2 ---? 2FeCl3
300
Express 3142574805723489 in scientific notation with 4 sig figs.
3.143 X 10^15
300
How many amus are there in 50 atoms of Neon?
50 atoms X (20.18 amus/1atom) = 1009
300
How many grams are in 2 moles of NaCl?
116.88g
300
An oxide of aluminum is formed by the reaction of 4.151 g of aluminum with 3.692 g of oxygen. Calculate the empirical formula.
Al2O3
300
Cu + AgNO3 ---> Cu(NO3)2 + Ag
Cu + 2AgNO3 ---> Cu(NO3)2 + 2 Ag
400
How many significant figures are in 0.00038203840001000?
14
400
What is the molar mass of CH3COOH (acetic acid)
60.05g
400
How many atoms are in 50 g of helium?
(50g / 4g/mol) X 6.02X10^23
400
A compound used as an additive for gasoline to help prevent engine knock shows the following percentage composition. 71.65% Cl 24.27% C and 4.07% H. The molar mass is known to be 98.96. Determine the empirical formula and the molecular formula for this compound.
ClCH2
Cl2C2H4
400
Zn + HCL ---> H2 + ZnCl2
Zn +2HCl ----> H2 + ZnCl2
500
(1.2X10^-3) + (3.5X10^-2)
3.62X10^-2
500
What is the molar mass of MtI3
What is 648.7
500
How many atoms are in 1 mol of Ununquadium?
6.02 X 10^23 atoms
500
A white powered is analyzed and found to have an empirical formula of P205. The compound has a molar mass of 283.88g. What is the compound's molecular formula?