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Empirical Formulas
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Random Chemistry
100

Avogadro's number is...

What is 6.02x10^23

100
The empirical formula for C6H8
What is C3H4
100
Which is the mass of 8 moles of sodium chloride?
What is 468 Grams
100
The percent of hydrogen in water.
What is 11.2 %
100

Au is the symbol for what element

Gold

200
The generic/basic set-up for a moles of A to grams of A conversion...
What is Given mol A x (molar mass A/ 1 mol A)
200
Which term is described as the percent by mass of any element in a compound? a. hydrate b.empirical formula c. molecular formula d. percent composition
What is D, percent composition
200
Calculate the number of molecules in 4.0 mol H2O.
What is 2.4 x 10^24
200
The percent of potassium in potassium bromide.
What is 32.9 %
200
What needs to be done to the balance before weighing anything.
What is taring or (zeroing) the balance
300
How many moles of atoms are in one mole of AlPO4?
What is 6 moles
300
The substances that have the same empirical formula are: A) CH2O B) C6H12O6 C) C2H4O2 D)C7H5O2
What are A and B
300
Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles of copper.
What is 2.67 g
300

What's the percent composition of MgS 

37.5% Mg 

57% S 

300
How many moles chlorine should be produced from 4 moles of aluminum chloride? 2AlCl3 + 3 Br2 --> 2 AlBr3 + 3 Cl2
What is 6 moles Cl2
400
What is the molar mass of Ca(OH)2?
What is About 74 g/mol
400
Which is the percent composition of sodium in the compound NaBr
What is 22.3 %
400
How many molecules are in 3.6 grams of NaCl?
What is 3.7 x 10^22 molecules
400

If I have 5 g of Aspirin with this percent composition - 4.48% H, 60.00% C, 35.52 % O; how many grams of H do I have? 

0.224 g

400
Phosphorus pentachloride has this formla.
What is P2Cl5
500
A student said that 20 moles of Al would be produced from 20 moles of Al2O3 for the reaction: Al2O3 --> Al + O2 What did they do wrong, and what is the correct answer?
What is forgot to balance the equation (use the correct mole ratio) and 40 mol.
500
Which is the formula for a compound that contains 64.75 g nitrogen and 185.25 g oxygen?
What is N2O5
500
A balloon contains 4.50 x10^22 atoms of helium (He2) gas. Calculate the mass of helium in grams.
What is 0.58g
500

If I have 25 g of N2S2 - how many grams of this compound are N? 

7.6 g of Nitrogen

500

When zinc reacts with HCl what gas is created? 

hydrogen