General Chemistry Answers

Calculate ΔS°for the combustion of ethyne.

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)

Substance and S°(J/K·mol)

C₂H₂(g): 201

O₂(g): 205.138

CO₂(g): 213.741

H₂O(g): 88.825

a)-195.1 J/K

b)-176.1 J/K

c)195.1 J/K

d)176.1 J/K

What is scientific notation

what is the particle X in AI-28 decay according to the following equation. 28/13 A1 -> 28/14 Si + X

I hope this finds you all well!

Information:

I would like to know how to calculate the percent purity of a precious metal after it's been smelted. ( I provided the information for whats being smelted below)

Silver quarters weigh 6.25 grams and are composed of 90% silver, 10% copper, with a total silver weight of either:

0.1808479 troy ounces pure silver.

or

0.198415981714 ounces pure silver.

Question:

let's say we have 1lbs of silver quarters listed above. Using proper temperatures to separate the copper during smelting how does one calculate the % purity of the silver after you pour?

Thank you for your help everyone.

Aqueous hydrobromic acid (HBr) will react with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H_2O). Suppose 9.71 g of hydrobromic acid is mixed with 6.5 g of sodium hydroxide. Calculate the maximum mass of sodium bromide that could be produced by the chemical reaction. Be sure your answer has three significant digits.

Arginine is an amino acid which has the following pKa values: pK₁: 2.17, pK₂: = 9.04, pK_R = 12.48. Calculate the net charge of arginine at the pH value of 4.

A 560.0 mL of 0.61 M sodium bromide, NaBr solution has a density of 1.046 g mL-1

. Calculate the

molality of the solution.

A steel ball bearing with a circumference of 33.75 mm weighs 4.85 g.    What is the density of the steel in cg/L.