A blood sample contains 0.02 mg/L of oxygen. Find the pressure of oxygen per liter at 37°C.

At STP a gas occupies 0.213L. How many moles are there in this sample?

L is a non-volatile, non-electrolytic liquid. A solid S is added to L to form a solution that just boils at 1 atm pressure. The vapor pressure of pure L is 850 torr. What is the mole fraction of liquid L in the solution?

What is most nearly the combined volume of 1.0g hydrogen gas H2 and 10.0g of helium He when confined at 20°C and 5atm?

Find the mass of 3 moles platinum in pounds. Atomic weight is 195 amu.

A bicycle tire has a volume of 600 cc. It is inflated with CO₂ to a pressure of 80 psi at 20°C. How many grams of CO₂ are contained in the tire?

If 2.25g of pure calcium metal are converted to 3.13g of pure calcium oxide CaO, what is the atomic weight of calcium in g/mole? The atomic weight of oxygen is 16g/mole.

What is the rms velocity of oxygen molecules at 20°C?

The number of grams of sodium thiosulfate (Na₂S₂O₃) needed to prepare 500mL of 0.4M solution is,

15.0mL of a 0.15N NaOH solution requires 12.0mL of sulfuric acid (H₂SO₄) solution for neutralization. What is the molarity of the acid solution?

A 20-gram sample of fish fillet was found to contain 0.5 mg of mercury. What is the concentration of mercury in the fish fillet in ppm?

In a given amino acid solution the hydroxyl ion concentration is 10^-5M. Find the pH of the solution.

Calculate the molality of an alcohol in aqueous solution if the mole fraction of the alcohol is 0.150.

0.40g of a volatile liquid occupies 107 mL at 1.00atm pressure and 27°C. What is the molecular weight of the liquid?

What is the oxidation number of Cr in the dichromate ion (Cr₂O₇)^-2?

The atomic mass of chlorine is 35.45 g. What is the root-mean-square of molecular chlorine in m/s at 31°C?

Calculate the molar mass of a certain gaseous organic compound having a density of 0.00356 g/mL at 2.12 atm and 45°C.

Calculate the volume occupied by 50.6 g of HCl at STP. (H = 1.008 amu and Cl = 35.45 amu).

Find the density (kg/cu.m) of uranium hexafluoride at STP. (Atomic weights are U = 238, F = 19).

Two gas compounds, HBr and CH4 have molecular weights of 81 and 16 respectively. The HBr compound diffuses through a small opening at the rate of 4 mL/s. At what rate in mL/s will the other compound diffuse through the same opening.

Solve for the volume occupied by 3.12 moles of nitric oxide (NO) which exerts 5.43 atm of pressure at a temperature of 82°C.

What is the percent composition by mass of oxygen (0) element in sulfuric acid (H2S04)? H = 1.008 amu, S = 32.07 amu and 0 = 16.00 amu.

How many grams are represented in 2.50 mol of H₂O?

Chemical analysis of methyl ether showed it to be composed of 52.17% C, 13.05% H and 34.78% O. Determine its empirical formula.

Find the percent composition of sodium in borax, Na₂B₂O₇. (Atomic mass: Na = 23; B = 10.81; O = 16).

How many liters of 2M solution can be produced from 184 g of ethyl alcohol CH₂CH₂OH?

For a single year, the motor vehicles in a large city produced a total of 9.1x10^6 kg of poisonous gas carbon monoxide (CO). How many moles of CO does this correspond to? (Atomic weight of carbon = 12 g/mole of oxygen = 16 g/mole).

At 0 deg C and under a pressure of 100 atm the compressibility factor of oxygen is 0.927. Calculate the weight of oxygen in kg necessary to fill a gas cycle of 100 L capacity under given condition?

If the atomic weight of carbon-12 is exactly 12 amu, find the mass of a single carbon-12 atom?

The molality of a solution of ethyl alcohol, C₂H₅OH in water is 1.54 mol/kg. How many grams of alcohol are dissolved in 2.5 kg of water?