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If 1.50 g of X reacts with 3.54 g of M to produce 5.04 g of a compound with the formula M4X3 and the atomic mass of M is 48.5 amu, what is the atomic mass of X?
A 126 piece of metal is heated to 285 and dropped into 83.0 of water at 26. If the final temperature of the water and metal is 58.3, what is the specific heat of the metal?
When a 1.50 g sample of aluminum metal is burned in an oxygen atmosphere, 2.83 g of aluminum oxide are produced. However, the combustion of 1.50 g ultrafine aluminum in air results in 2.70 g of a p
Calcium sulfide has a face-centered cubic unit cell with calcium ions in octahedral holes. If the radius of sulfide ion is 184pm and the density of CaS is 2.60 g/cm3, what is the radius of the calc
A 1.00 g sample of enriched water, a mixture of H2O and D2O, reacts completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A
Calculate the molecular rms speeds of He atoms at 10, 100, 1000 K in units of meters per second and miles per hour.
The absorption spectrum of chlorophyll a has maxima at 663 and 420 nm. What colors correspond to these wavelengths? What color will be seen reflected by an object with this absorption spectrum?
A portable electric water heater transfers 225 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in nanoseconds) will it take for the water to heat 5.5 L of water from 298.15 K
Then swinging the thermometer back and forth in air. it is observed that the the wet-bulb thermometer is always less than or equal to the dry-bulb temperature. explain why?
If 3.40 g of copper was recovered and you started with 7.05 g of copper (II) chloride, then what is the percent yield of the reaction ?
What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other frequency) with a total energy of 1.91*10^-7
A solution of acetic acid, CH3COOH, has a concentration of 0.199 M and a density of 1.00 g mL-1. What is the molality of this solution?
Abundance mass74%, 93amu and 26%, 117amu. What is the atomic weight for exonium? Answer in units of amu.
The column is operated under total reflux and the distillate composition was measured as 0.982 mole fraction chloroform and bottoms of 0.037 mole fraction chloroform. Determine the relative volatili
Derive an expression for the mean free path for any gas in terms of the collision diameter, the temperature, and the pressure.
Rb has two naturally occurring isotopes 85Rb and 87Rb, with masses 84.9118 amu and 86.9092 amu, respectively. The average atomic mass is 85.468 amu. What is abundance of each one?
At what level of protein structure is limited rotation of peptide bonds important? What is the impact of protein structure on protein function?
Calculate the percentage conversion of functional groups required to obtain a polyester with a number-average molar mass of 24,000 g mol-1 from the monomer HO(CH2)14COOH.
Evaluate the number-average molar mass Mn of the polyamide, and also estimate its weight-average molar mass Mw by assuming that it has the most probable distribution of molar mass.
If the density of water is 1.00g/mL, what is the weight in pounds of gallom of water? you may assume that mass and weight are equivalent at the earth's surface.
A Typical packet contains 250 grams of iron to warm your hands or feet for up to 4 hours. How much heat is produced in this reaction?
Caluclate % recovery of panacetin from the individual masses of its mictures, sucrose (.044g), aspirine (.093), and the unknown (.339).
Calculate the mass of FeS formed when 9.42 g of iron metal reacts with 8.50 g of sulfur according to the following reaction.