Daily quizes

17 important questions on Daily quizes

A compound has a chemical composition of 97.6 g carbon, 4.9 g hydrogen, 52 g oxygen, 45.5 g nitrogen.    What is the empirical formula?


C5H3O2N2

Which of the following is NOT an empirical formula?

N2O5
MgCl2 C6H12O6

C6H12O6

A compound has a chemical composition of .62 g carbon, .10 g hydrogen, .28 g oxygen.    What is the empirical formula?


C3H6O
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A mineral consisted of 29.4% calcium, 23.5% sulfur and 47.1% oxygen. What is the empirical formula?

CaSO4

26 g of zinc combines with 12.8 g of sulfur. What is the empirical formula of zinc sulfide?
ZnS

Zn2S2
znS2

ZnS

A(n) __________formula is one that shows the lowest whole number ratio of the elements in a compound>

empirical

A compound has a chemical composition of 32.8% chromium and 67.2% chlorine.   What is the empirical formula?

CrCl3 CrCI
CrCl2

CrCI3


Vinegar, which has  many applications, has the following percent composition: 39.9% carbon, 6.7% hydrogen and 53.4% Oxygen. What is the empirical formula?


C3H6O3

CH2O 
CHO

C2H4O2

CH^2O

What is the name of the procedure which determines the composition of the elements in a compound?

elemental analysis

What is the empirical formula mass (EFM) of P2O5?

141.94

Write the formula for copper (II) sulfate hexahydrate.

CuSO^4 times 6H^20

An analysis reveals that a substance consists of 65.5% of carbon, 5.5% of hydrogen and 29.0% of oxygen, If the molar mass of the compound is 110 g/mol, what is the MOLECULAR Formula?


C6H6O2

Find the percent composition of water in barium chloride dihydrate. Round answer.

16%


Name the following hydrate CuSO4 · 5 H2O.


copper (II) sulfate pentahydrate

An unknown substance has the composition of 77.87% C, 11.76% H and 10.37% O. The compound has a molar mass of 154.25 g/mole. What is the molecular formula?


C10H18O

If the empirical formula of a compound is CH2 and the molar mass is 70.0 g/mol, what is the molecular formula?

C5H10

Write the formula for magnesium sulfate trihydrate.


MgSO4 3H2O

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