Other Chemistry Answers

You need 0.56 mol of electrons to deposit a thin covering of silver on a part that you are using for a prototype machine. How long would you need to run a current of 5.0 A to obtain this number of moles?

15.5 mL of 0.33 mol/L calcium acetate reacts with 20.5mL of 0.45 mol/L silver chlorate. Determine the concentration of the acetate ion in the final solution.

Ca(CH3COO)2(aq) + 2 AgClO3(aq) --> 2 AgCH3COO(s) + Ca(ClO3)2(aq)

A) 0.014 mol/L

B) 0.028 mol/L

C) 0.0 mol/L

D) 0.37 mol/L

Which is the right answer?

in a BaI2 solution if the concentration of I- = 0.386 M then what is the concentration of BaI2

consider the following reaction :2Al + Cr2O3 = Al2O3 +2cr. what is the mass of Al2O3 that will be produced upon complete reaction of 1.20* 10^21 atoms of Al

how many moles of iron (III) is produced by 0.030 moles of iron in the following reaction 4fe + 3o2- 2fe2o3

The decomposition of KClO

3

is commonly used to prepare small amounts of O

2

in the

laboratory:

2 KClO

3

s → 2 KCl s + 3 O

2

g

How many grams of O

2

can be prepared from 4.50 g of KClO

3

?

A 4.0520g sample of HCl, specific

Gravity 11.18, required 44.15ml of 0.9035M of Sodium Hydroxide in titration, compute for percent purity.

The mass (in grams) of copper produced is 2.46 g .

*The limiting reagent is Iron (steel wool)

1)Calculate the theoretical yield (in grams) of Copper?

a) 3.99

b) 1.28

c) 2.28

d) 1.98

2)What is the actual yield of Copper? 

a) 2.78

b) 3.99

c) 2.58

d) 2.46

3)Determine the percent yield. 

a) 61%

b) 67%

c) 88%

d) 108%

4) What type of reaction occurred

Five and one-half tons of compost containing 2.1 % N, 1.15 % P2O5, and 0.97% K2O  can supply how many kilograms of N, P2O5  and K2O?

1. Calculate the volume of the original sample needed if you would use a 50 mL volumetric flask, a 100 mL volumetric flask, and a 250 mL volumetric flask to prepare a dilution of 1:25.