Given the following equation:
3 Ag2S + 2 Al --> 6 Ag + Al2S3
15.4 g of Al can react with how many grams of Ag2S? You must show all work clearly and in detail to receive credit. All numbers immediately following elemental symbols should be understood as subscripts.
Alkali metals are extremely reactive with water. Suppose I give you a 85.50 g chunk of sodium and you throw it into a lake. When it reacts with water to form sodium hydroxide and hydrogen gas, how many grams of hydrogen is theoretically produced? Write a balanced equation for the reaction and show all work clearly and in detail to receive credit.
Consider the solubility rules and identify all of the spectator ions when the following chemicals react: A) lead (II) nitrate and ammonium chloride B) Barium bromide and potassium sulfate. You must show all work (equations) clearly and in detail to receive credit.
A compound has a percent composition of 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen. What is its empirical formula? You must show all work to receive any credit.
The diesel tank on a tractor has a capacity of 11.0 gallons. Assume the density of petroleum diesel is 0.823 kg/L.
(1) When the tank is full, what is the mass of fuel in pounds? Potentially useful information: 1 gal = 3.79 L; 1 lb = 453.59 g.
(2) Diesel fuel is actually made of various hydrocarbon compounds that have carbon chains ranging from 8 to 21 carbon atoms. For the sake of simplicity, assume the average formula is C12H24 (the 12 and 24 are subscripts). If we use this as the formula for diesel fuel, how many moles of diesel fuel are in a full tank?
All work must be shown, labeled, and explained in detail to receive credit. Note that superscripts (X2) can be written as X^2 and subscripts (X2) can be written as X_2 if it saves you time. Be careful to account for significant figures in your final answers.
A compound was isolated and the lab results show that it contains the following elemental composition and molar mass:
|
Element
|
Percentage (%)
|
|
C
|
54.50
|
|
N
|
31.78
|
|
H
|
13.72
|
(1) What is the empirical formula and molecular formula for this compound?
(2) Determine how many N atoms would be in a 5.00 g sample of this compound.
All work must be shown, labeled, and explained in detail to receive credit. Note that superscripts (X2) can be written as X^2 and subscripts (X2) can be written as X_2 if it saves you time. Be careful to account for significant figures in your final answers.