need help answering questions

Empirical

1.

What is the empirical formula of a compound composed of 25.1 g

of potassium (K

) and 5.14 g

of oxygen (O

)? Insert subscripts as needed.

empirical formula:

KO


2.



A 17.02

g sample of a compound contains 5.43

g of potassium, K,

4.92

g of chlorine, Cl,

and oxygen, O.

Calculate the empirical formula.

Insert subscripts as needed.

Empirical formula:

KClO


3.


A 9.32

g sample of a compound contains 5.95

g of iron, Fe,

1.10

g of phosphorus, P,

and oxygen, O.

Calculate the empirical formula for the compound.

empirical formula:

4.

Determine the empirical formula for a compound that contains 58.8%

C, 9.8%

H, and 31.4%

S by mass.

empirical formula:

5.

Determine the empirical formula for a compound that is 62.1%

C, 10.4%

H, and 27.5%

O by mass.

empirical formula:

6.

What is the empirical formula of a compound composed of 3.25% hydrogen (H

), 19.36% carbon (C

), and 77.39% oxygen (O

)by mass?

Insert subscripts as needed.

empirical formula:

HCO



hw 8


For the chemical reaction shown,

2H2O2(l)+N2H4(l)4H2O(g)+N2(g)

determine how many grams of N2 are produced from the reaction of 9.97

g of H2O2 and 6.35

g of N2H4.

g



When heated, KClO3

decomposes into KCl

and O2.

2KClO32KCl+3O2

If this reaction produced 89.1 g KCl,

how many grams of O2

were produced?

g O2


1.



When 0.540

g of sodium metal is added to an excess of hydrochloric acid, 5610

J of heat are produced. What is the enthalpy of the reaction as written?

2Na(s)+2HCl(aq)2NaCl(aq)+H2(g)

When methanol, CH3OH,

is burned in the presence of oxygen gas, O2,

a large amount of heat energy is released, as shown in the combustion reaction.

CH3OH(g)+32O2(g)CO2(g)+2H2O(l)Δ =764 kJ

Based on the balanced thermochemical reaction, how much heat is produced when 33.6 g

of methanol reacts with 52.1 g

of oxygen?

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.

CaCO3(s)+2HCl(aq)CaCl2(aq)+H2O(l)+CO2(g)

How many grams of calcium chloride will be produced when 30.0 g

of calcium carbonate is combined with 12.0 g

of hydrochloric acid?

:

g

Which reactant is in excess?

How many grams of the excess reactant will remain after the reaction is complete?

Nitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia.

N2(g)+3H2(g)2NH3(g)

Assume 0.200 mol N2

and 0.633 mol H2

are present initially.

After complete reaction, how many moles of ammonia are produced?

:

mol

How many moles of H2

remain?

mol

How many moles of N2

remain?

mol

What is the limiting reactant?

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