General Chemistry Answers

1.   Aluminum chloride, AlCl₃, is an inexpensive reagent used in many industrial processes. It is made by treating scrap aluminum with chlorine according to the following equation. Please balance the equation.

              __2_ Al _(s)   +  3___ Cl_2(g)                   _2___ AlCl_3(s)

If you start with 3.11 g of Al and 5.32 g of Cl₂, which reagent is limiting? How many grams of AlCl₃ can be produced? During an experiment you obtained 5.57 g of AlCl₃, what was your percent yield?

1.   Calcium phosphate, silicon dioxide, and coke may be heated together in an electric furnace to produce phosphorus, as shown in the following equation:

2 Ca3(PO4)2(s) + 6 SiO2(s) + 10 C(s) → 6 CaSiO3(s) + 10 CO(g) + P4(g)

In this reaction, what mass of calcium phosphate would be needed to make 100.0 g of phosphorus? What mass of calcium silicate would be formed as a by-product

Teachers at Evilsville East High School have 34.56 grams of silver nitrate, how many

moles of silver can they make to sell to Dentists-R-Us? (2.1, 5.2)

a. AgNO3(aq) + Cu(s) →

1) A gaseous mixture contains oxygen gas and nitrogen gas. If the weight of oxygen gas is 20.0 grams and its mole fraction is 0.18, find the weight of nitrogen gas in the mixture.

2) A solution of sodium hydroxide has a density of 1.14g/mL and contains 32.8% sodium hydroxide by mass. If 40.0 mL of this solution is diluted with 30.0 mL of water, what is the concentration of the diluted sodium hydroxide?

Which will boil faster a salt solution or a pure water

find the concentration of the of dilute hydrochloric acid solution using titration against a standard sodium hydroxide solution.. Do the necessary calculations ensuring that you clearly show all working, statements and answers including units. You are required to first find the molar concentration then find the mass concentration of the acid. 

Above which temperature, in K, will the following reaction proceed spontaneously? Round off your answer to the nearest whole number and omit the unit.

C

a

C

O

3

(

s

)

→

C

a

O

(

s

)

+

C

O

2

(

g

)

Δ

H

o

=

+

178.4

k

J

m

o

l

Δ

S

o

=

+

160.6

J

m

o

l

K

How many moles are in 2 Liters of a 2 M KMnO4 solution?

What is the nickel ion concentration in a solution prepared by mixing 439 mL

439 mL of 0.372 M

0.372 M nickel nitrate with 401 mL

401 mL of 0.353 M

0.353 M sodium hydroxide? The 𝐾

sp

Ksp of nickel hydroxide is 5.48×10−16

5.48×10−16 .

Which half reaction correctly represents reduction?

Mn4 + 3e= Mn7+

Mn4=Mn3+ +e-

Mn4+ =Mn7+ + 3e-

Mn4+ + e- = Mn3+