Explore BrainMass
Share

# Stoichiometry

### Partial pressure, mole fraction, total pressure and pressure conversion.

A tank contains 3.0 moles of nitrogen, 2.0 moles of oxygen, 1.5 moles of helium, and 1.8 moles of carbon dioxide at 45C and under 1000 atm. Calculate the partial pressure of each gas in the mixture in Torrcellis.

### 4.626g sample of hydrocarbon upon combustion yielded 6.484g of CO2, what is the % by weight of the carbon in the hydrocarbon?

4.626g sample of hydrocarbon upon combustion yielded 6.484g of CO2, what is the % by weight of the carbon in the hydrocarbon?

### Density: Mass and Volume

A sphere made of nickel (d=8.908g/cm^3) has a diameter of 8.20 cm. What mass of nickel was used in making the sphere? (V of sphere = 4/3 pi r^3).

### Given % yield, calculate grams obtained

Balance the following equation: AsF3 + CCl4 ---> AsCl3 + CCl2F2 the theoretical yield of CCl2F2 = 1.68 moles if the actual yield was 74.3% in the reaction, how many grams of CCl2F2 were obtained

### Precipitate from Reactions

Silver nitrate reacts with iron(III)chloride Fe Cl3 to give AgCl and Iron(III)nitrate Fe(NO3)3. A solution with 18 grams of AgNO3 was mixed with a solution. 32.4 grams of FeCl3. How many grams of which reactant remains after reaction?

### Combustion of hydrocarbons

Propane, C3H8, in a tank that is usually the size of a basketball is often used for grills. a) Write a balanced equation for the combustion of propane. b) Calculate the number of moles of oxygen required to burn 5000.0 g (11.0 lbs) of propane. c) Calculate the number of kilograms of O2 required to burn propane.

### Mole Concept: Number of molecules in CO2.

Q. In 154 grams CO2, how many molecules

### Moles and Molarity Pproblems

A 12.0% sucrose solution has a density of 1.05g/cm^3. The number that gives the best value for the mass of sugar in 55mL of this solution is? I need step by step answer for this question please. What is the Molarity(m) of a solution that contains 73.5g of 1,4-dichlorobenzene,C6H4Cl2, in 500mL of carbon tetrachloride? (The

### Chemistry calculations including calculating molecular formulas

What is the molecular formula of a compound that contains 42.87% carbon, 3,598% hydrogen, 25.00% nitrogen and 28.55 oxygen and has a molar mass between 165 and 170? How many grams of lithium contain the same number of atoms as 2.50 Kg of zirconium? If the molar mass of a binary compound has a molar mass between 27 and 28 a

### The fluoride ion is very toxic.

The fluoride ion is very toxic. Not only does it interfere with glycolysis, but if forms an insoluble precipitate with calcium ions (Ksp = 4.13 x 10-11). Give an explanation as to why CaF2 is insoluble; whereas, other calcium halides are soluble in the order CaI2>CaBr2>CaCl2. How much fluoride (as sodium fluoride) would you h

### Stochiometery 4

When 19.8g butane, C4H10 is burned with excess oxygen: 2C4H10g + 13O2g -----> 8CO2g +10H2Og How many grams of oxyen are consumed, how many grams of CO2 & H2O are produced?

### A 0.250g sample of a compound containing only carbon and hydrogen whose molecular weight is 16g/mol

A 0.250g sample of a compound containing only carbon and hydrogen whose molecular weight is 16g/mol is burned in oxygen to yield 0.784g CO2 and 0,642g H2O. What is the molecular formula of the compound?

### Combustion Reaction Problem

Consider the combustion of methane, CH4 CH4 (g) + 202 (g) ----> CO2 (g) + H2O (g) Suppose 8.00g of CH4 is allowed to burn in the presence of 6.00g of 02. How much (in grams) CH4, 02, CO2, and H2O remain after the reaction is complete? Please show the required calculations.

### Average Density of the Sun

I need some help figuring this question out: The sun has estimated mass of 2x10^36 and the sphere is of average radius of 6.96x10^5 km, calculate the average density of the sun in units of kg/km^3; kg/m^3; g/cm^3 and lbs./ml (hint: use answer from c to convert).

### How many liters of CO2 gas are released?

When 10 grams of calcium carbonate are treated with 50 ml of HCl which has a density of 1.096g/ml the calcium carbonate dissolves giving a solution and releasing CO2 gas. The solution weighs 60.4g. How many liters of CO2 gas are released? The density of the gas is 1.798grams/liter

### Mole problem - package of M&M candies contains 50 pieces

A package of M&M candies contains 50 pieces. What fraction of a mole is this? Express in both normal and scientific notation. A package of 50 m&m candies cost 50 cents. How much would a mole of m&m's cost in dollars? Given the annual budget of the US is 2 trillion dollars, how many years would it take the US to pay for a mol

### Mole problem - The volume of an M&M candy

The volume of an m&m candy is .65 mL. What volume in cubic meters, would one mole of m&m candies occupy? Next, compare the volume of a mole of m&m's to lake erie, which has a volume of 116 mi^3. How many lakes the size of lake erie would a mole of M&M candies fill.

### Find number of protons, electrons, neutrons

Given the atomic number and the mass number of an atom how do we determine the number of protons in the nucleus? The number of neutrons in the nucleus? The number of electrons in the surrounding shells?

### Solutions, Density, Molecular weight

The alcohol content of hard liquor is normally given in terms of the "proof", which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 51 proof gin. The density of ethanol is 0.798 g/mol. (solution in grams) Arginine vasopressin is a pitui

### Solutions, Density, Molecular weight

The alcohol content of hard liquor is normally given in terms of the "proof", which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 51 proof gin. The density of ethanol is 0.798 g/mol. (solution in grams, please) Arginine vasopressin is

### the percent abundance of each isotope of chlorine

Chlorine has two naturally occuring isotopes, 35 Cl (isotopic mass 34.9689 amu) and 37Cl (isotopic mass 36.9659 amu). If chlorine has an atomic mass of 35.4527 amu, what is the percent abundance of each isotope?

### Finding atoms in a sample

Avogradro's number (6.022 x 10^23 atoms/mol) is a useful number that can be used to calculate a number of different values for compounds/elements. One important value is finding the number of atoms in a specific mass of an element. The solution includes a general step-by-step method of finding the number of atoms in a specific

### Molarity and Mass

A 30.0ml sample of a solution of NaCLO3 that contains 1.06 g of NaClO3 is to react with a solution of I2. What is the molarity of the NaClO3 solution? Also, what mass of Molybdenum3 oxide, Mo2O3 will be completely oxided to potassium molybdenum, K2MoO4 by 35.Oml of .200 MkMnO4.

### Titration: Finding Percent CuSO4 in a Solution

Copper 2 ions can be determined by the net reaction 2Cu +2I- + 2S2O3)2----->2Cu(s)+S4O6)2- A 2.115-g sample containing CuCO4 and excess KI is titrated with 32.55ml of o.1214M solution of NA2S2O3. What is the percent CuSO4? (159.6/g mole in the sample)

### Equations and Formulas

1. Write the equation for the decomposition of the hydrate, CuSO2*XH2O. 2. Record the following masses: (a) mass of the empty crucible (g): 53.200g (b) mass of the crucible and hydrate (g): 58.200g (c) mass of the crucible and pure salt (g): 56.396g 3. Calculate the following: (a) mass of wa

### Moles to Moles

1. Record and calculate the following: (a) Mass of copper used in the reaction (g) 114.815g (b) Moles of copper used in the reaction (a simple stoichiometric conversion of mass to moles using the molar mass for copper of 63.5 g/mol. Show your work). (b) Mass of beaker and dry silver (g) 313.867

### General Chemistry

Question 11.2 Which one of the following does not occur as diatomic molecules in elemental form? Bromine Nitrogen Hydrogen Sulfur Oxygen Question 12.2 Sulfur forms an ion with a charge of _______. +3

### General Chemistry

Question 1 If matter is uniform throughout and cannot be separated into other substances by physical means, it is _______. a compound an element a homogeneous mixture either an element or a compound a heterogeneous mixture

### Concentration of the solution expressed as % (w/w)

An aqueous solution is found to have a density of 1.04g/mL. If the solution was prepared by dissolving 45.0 grams in enough water to make 1.00 L of solution, what is the concentration of the solution expressed as % (w/w)? please provide step by step instructions, Do not know where to begin, or direction

### Identify Unknown Element Given Atomic Mass and Percent Abundance

An unknown element is found to have three naturally occurring isotopes with the following information. Atomic mass Percent abundance 35.9675 0.337% 37.9627 0.063% 39.9824 99.600% Which of the follwoing is the unknown element? a. Cl b. Ca c. K d.