Molecular Mass

The molecular mass of sodium chloride is 58,44 g; 13 g is equal to 0,222 moles.

Manganese is a metal element. Atomic mass of it is 55.

Molecular mass of sulfuric acid is 98 u. Molecular mass of potassium and nitrate ions are 39 and 62 respectively. The molar mass of potassium nitrate is 101u.

Using the formula for osmotic pressure π = iMRT, where i is the van't Hoff factor, M is the molarity in mol/L, R is the gas constant, and T is the temperature in Kelvin, we can calculate the osmotic pressure. First, determine the number of moles of solute in the solution using the given mass and molecular mass. Then calculate the molarity of the solution. Finally, plug in the values and solve for the osmotic pressure.

The atomic mass shown on the periodic chart is the weighted average of the naturally occurring isotopes of that element.

It works like this: What is the average weight of 4 people where three weigh 120 and one weighs 90? (In this group, the most common weight is 120 so the average will be close to 120) The weighted average is:

75% x 120 + 25% x 90 = 90 + 22.5 = 112.5

All of the member's weights were whole numbers but the average is a fraction.

Each isotope, similarly, has a whole number weight but they occur at different percentages.

If you see a whole number weight on the periodic chart it is the weight of the longest-lived isotope since it has no naturally occurring stable isotopes...you will sometimes see this weight in parentheses.

The atomic mass of phosphurus is 31. The atomic mass of chlorine is 35.5. Therefore, the gram molecular mass of PCl3 is 31+3x35.5=137.5 grams per mole.

To calculate the osmotic pressure of the solution, you can use the formula: π = iMRT, where i is the van't Hoff factor (number of particles into which the solute dissociates), M is the molarity of the solution, R is the ideal gas constant, and T is the temperature in Kelvin. First, find the molarity (M) by dividing the mass of the solute by its molecular mass and the volume of the solution in liters. Then, plug in the values and calculate the osmotic pressure.

The molar ratio of hydrogen to oxygen in the compound is 2:1. To find the empirical formula, divide the moles of each element by the smallest number of moles, which is 0.059 mol for hydrogen. This gives a ratio of 1:0.5 for hydrogen and oxygen, which simplifies to the empirical formula H2O. To find the molecular formula, calculate the molecular mass of H2O (18 g/mol) and divide the given molecular mass (34 g/mol) by the empirical formula mass to get the multiplier of 2. So, the molecular formula of the compound is H2O2.

The number of moles of the solute can be calculated as 69.7 g / 2790 g/mol = 0.025 mol. Using the formula for osmotic pressure, π = nRT, where R is the ideal gas constant and T is the temperature in Kelvin, and since 1 dm^3 = 1 L, the osmotic pressure can be calculated. Let's assume T = 20°C = 293K, and R = 0.0821 L.atm/mol.K. Substituting the values, we get π = (0.025 mol)(0.0821 L.atm/mol.K)(293K) = 0.601 atm. Thus, the osmotic pressure of the solution is 0.601 atm.

The molar ratio of hydrogen to oxygen in the compound is 1:1. This means the compound is water (H2O), which has a molecular mass of 18.0 g/mol, not 34.0 g/mol. The given molecular mass of 34.0 g/mol does not match the properties of water.

To calculate the molecular mass of the solute, we need to use the formula for freezing point depression: ΔTf = Kf * m. Given that the ΔTf is -0.430°C, the molal concentration (m) of the solute can be found by dividing the grams of solute by the grams of water. Substituting these values into the formula allows us to solve for Kf, which can eventually be used to determine the molecular mass of the solute.

The molecular mass of Zinc fluoride (ZnF2) is calculated by adding the atomic masses of zinc (Zn) and two fluorine (F) atoms. The atomic mass of zinc is approximately 65.38 g/mol, and the atomic mass of fluorine is about 18.99 g/mol. Therefore, the molecular mass of ZnF2 is approximately 102.36 g/mol.

The empirical formula of C2H5 corresponds to an empirical mass of 29 g/mol. To find the molecular formula from the empirical formula and molecular mass, divide the molecular mass by the empirical mass to get the "scaling factor" (58 g/mol ÷ 29 g/mol = 2). Multiply the subscripts in the empirical formula by the scaling factor to get the molecular formula: C2H5 x 2 = C4H10. So, the molecular formula is C4H10.

Water is composed of two hydrogen and an oxygen atom. Their respective atomic numbers are 1 and 16. Therefore the RMM of water is 2x1+16=18.

The formula for percent error is |experimental value-accepted value|/accepted value.

The lines stand for absolute value. They are there to prevent a negative percent error, seeing as that is not possible, and they have the same effect on the order of operations as a pair of parenthesis.

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Sodium has a relative atomic mass of 22,989 769 28(2) g/mole.

Fluorine has a relative atomic mass of 18,998 403 2 (2) g/mole.

Sodium fluoride (NaF) = 22,989 769 28 + 18,998 403 2 =

41,988 172 48 g/mole.

NaF is an ionic compound which exists as crystal lattice therefore the term FORMULA MASS is more accurate as compare to MOLECULAR MASS

The molecular mass of NaHSO4 (sodium hydrogen sulfate) is approximately 120.06 g/mol.

To calculate the number of moles in 2400g of CO2, we first need to determine the molar mass of CO2. The molar mass of CO2 is approximately 44.01 g/mol (12.01 g/mol for C + 2 x 16.00 g/mol for O). Then, we can use the formula: moles = mass / molar mass. Therefore, 2400g / 44.01 g/mol ≈ 54.5 moles of CO2.

The molecular mass of cytosine is approximately 111.1 grams per mole.

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The atomic mass of hydrogen is 1u. Atomic mass of bromine is 80u. Therefore, the molar mass of hydrogen bromide is 1+80=81u.

The empirical formula is CH2O. To find the molecular formula, you need to calculate the empirical formula weight (30 g/mol) and divide the molecular mass (180.0 g/mol) by the empirical formula weight to get 6. This means the molecular formula is (CH2O)6, which simplifies to C6H12O6, the molecular formula of glucose.

The molar mass of iron (III) oxide (Fe2O3) is approximately 159.69 g/mol. This is calculated by adding the atomic masses of two iron atoms and three oxygen atoms, which are 55.85 g/mol and 16.00 g/mol respectively.

One problem is that impurities in the water can affect the accuracy of the results. Additionally, water's freezing point is 0°C, which may limit the range of compounds that can be accurately measured using the freezing point depression method. Lastly, the specific heat capacity of water is relatively high, which can make it slower for the solution to reach thermal equilibrium.