A hypothetical compound has a formula of X2YZ3. If the atomic masses of X, Y, and Z are 41.2, 57.7 and 63.9 respectively, calculate the % by mass of the compound. If the molecular formula is actually X6Y3Z9, what is the percentage of each element present?
In the following reaction, first find how many grams of oxygen would be used to completely react with 1.30 moles of ethyl alcohol (C2H5OH)?
In the following reaction, first find how many grams of oxygen would be used to completely react with 1.30 moles of ethyl alcohol (C2H5OH)? Then calculate the number of carbon dioxide molecules and finally, the grams of water formed during reaction. C2H5OH + O2 -> C02 + H20
Hydrogen bromide can be produced by a reaction among bromine, sulfur dioxide, and water as follows...
Hydrogen bromide can be produced by a reaction among bromine, sulfur dioxide, and water as follows... S02 + Br2 +H2O (arrow) 2HBr + H2SO4 If 250 grams of SO2 and 650 grams of Br2 react in the presence of excess water, what mass of HBr will be formed?
Heating zinc sulfide in the presence of oxygen yields the following: ZnS + O2 (arrow) ZnO + SO2 If 1.72 mol of ZnS is heated in the presence of 3.04 mol of O2, which reactant will be used up? Balance the equation first.
Please explain how I would figure out this problem: From 0.80 L of a glucose stock solution, 4.0L of a 1.8% w/v solution of glucose was prepared. What was the concentration of the stock solution?
How many grams of KNO3 can be made from 591.9 g KCl and 830.0 ml of 12.0 M HNO3 by the reaction: KCl (s) + HNO3 (aq) ----> KNO3 (s) + Cl2 (g) + NOCl (g) +H2O (I) Also, how much of the excess reactant (grams if KCl or ml if HNO3) will be unused?
Calculate the molarity of Br- ions in 250.0 ml of a solution containing 25.9 g NaBr and 0.155 moles of HBr.
What volume, in ml, of 0.750 M HCl would be required to neutralize a 1.50 sample of Ca(OH)2?
Calculate the solubility of copper (II) carbonate CuCO3, in 0.500 M NH3. Ksp for CuCO3 = 3.00 x 10-12 and Kf for [Cu(NH3)4]2+ = 5.60 x 10 to the 11 power.
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
If 150.0 ml of HCl solution are required to react completely with 35.0ml of 0.010 M NaOH solution, what is the molarity of the HCl solution?
If 4.0 moles of hydrogen gas and 1.1 moles of nitrogen gas are brought together to react according to the following equation: 3H2 + N2 ----> 2NH3 What is the limiting reactant, how many moles of NH3 will be produced?
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 is burned in oxygen to yield 0.784g CO2 and 0,642g H2O. What is the molecular formula of the compound?
How Many Cl- ions are present in 50.0 g FeCl3?
Calculate the molar mass of Manganese IV oxide?
Consider the following reaction: C4H10O + 6O2-> 4CO2+5H2O deltaH=-2713kj How many grams of water will be produced if the reaction is conducted with 75.6g of C4H10O and 95.5 g of oxygen?
1. A sample of unknown Y is subjected to elemental analysis. The follwoing precentages by weight are found to be: C 40.0% H 6.7% O remainder of % by weight The molar mass is found to be 60.0 g A. Calculate the empirical formula (show work) B. What is the molecular formula of unknown Y. (Inclu
How many total moles of ions are released when each of the following samples dissolves completely in water? (a) 0.24 mol of Na3PO4 mol (b) 51.4 g of NiBr2 3 H2O mol (c) 4.07 1022 formula units of FeCl3 mol
I need to create 1.0 M solution with 5.21 grams of Na2CO3. I need to create 1.0 M solution with 4.12 grams of NaHCO3 . How much distilled water to is use to create these 1.0 M solutions.
A solution containing an unknown amount of methyl alcohol that is dissolved in n-octane is added to an excess of methylmagnesium iodide which is dissolved in the high boiling solvent, n-butyl ether. A gas is evolved from the reaction. The gas is collected and its volume determined to be 1.04 ml (corrected to STP). What is the
1. Calculate each of the following quantities. a. grams of solute in 173.4 mL of 0.207 M calcium acetate b. molarity of 576 mL solution containing 21.1 g of potassium iodide c. moles of solute in 145.6 L of 0.726 M sodium cyanide 2. Assuming that the volumes are additive, what is the concentration of KBr in a solution prep
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).
My son needs to demonstrate an experiment that can explain natural phenomena or the world of everyday experiences using scientific methods and employ theories to interpret his observations. Any ideas, material lists and steps would be helpful.
How would you modify the determination of density of a solid if the solid dissolved in water, as sugar does? Would your density measurements be more precise if you used a balance that weighed to more decimal places, but still used the same graduated cylinder for determining the volume?
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
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.
Given the atomic number and the mass number of an atom how do we determine the number of protons in the nucleus?
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?
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
Thriophene is a carbon-hydrogen-sulfur compound used in the manufacture of pharmaceuticals. When burned completely in excess oxygen, its combustion products are CO2, H2O, and SO2. Combustion of a 0.535 g sample yields 1.119 g CO2, 0.229 g H2O, and 0.407 g SO2. What is the empirical formula of thiophene? The molar mass of thiophe