The volume of 3.96g of a gas sample at standard conditions it was found to be 1.15L.Calculate its molecular mass.

Use PV = nRT and solve for n = number of mols. Then n = grams/molar mass. You know n and grams, solve for molar mass.

You can do it another way knowing that an ideal gas at STP will occupy 22.4L.
Therefore, n = 1.15L/22.4L = number of mols, then n = grams/molar mass.

Solution: n=1.15L/22.4L , n=0.0513 mol , then use n=m/M , M=3.96/0.0513 , ur M=77.13 g/mol , dats all

To calculate the molecular mass of a gas, we can use the ideal gas law equation:

PV = nRT

where:
P = pressure (at standard conditions, typically 1 atm)
V = volume (1.15 L in this case)
n = number of moles
R = ideal gas constant (0.0821 L•atm/mol•K)
T = temperature (typically 273 K at standard conditions)

First, let's rearrange the formula to solve for n:

n = PV / RT

Substituting the given values:

n = (1 atm)(1.15 L) / (0.0821 L·atm/mol·K)(273 K)

n = 0.048 mol

Now we can calculate the molecular mass (M) using the formula:

M = m / n

where:
M = molecular mass (in g/mol)
m = mass of the sample (3.96 g in this case)
n = number of moles (0.048 mol)

M = 3.96 g / 0.048 mol

M ≈ 82.5 g/mol

Therefore, the molecular mass of the gas sample is approximately 82.5 g/mol.

To calculate the molecular mass of a gas sample, we need to use the Ideal Gas Law equation, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

In this case, we are given the volume of the gas sample (V = 1.15L) and the mass of the gas sample (3.96g). However, we are not given any information about pressure or temperature. To solve this, we need to convert the mass of the gas sample into moles.

To convert the mass to moles, we can use the formula:

n = m / M

Where n is the number of moles, m is the mass of the sample, and M is the molar mass of the gas. Rearranging the formula, we can calculate the molar mass:

M = m / n

Substituting the given values:

m = 3.96g
n = ?

First, we need to calculate the number of moles (n). To do this, we use the formula:

n = m / M

Substituting the values, we get:

n = 3.96g / M

Now, we need to find the molar mass (M). To calculate this, we'll use the molar mass constant (M.M.C.) table or periodic table to find the atomic/molecular weight of the given gas.

Let's assume the given gas is nitrogen (N2) as an example. The molar mass of nitrogen (N2) is 28 g/mol.

Substituting the value of molar mass:

n = 3.96g / 28 g/mol

Simplifying:

n = 0.141 mol

Now that we have the number of moles (n), we can calculate the molar mass (M) using the formula:

M = m / n

Substituting the values, we get:

M = 3.96g / 0.141 mol

Simplifying:

M ≈ 28 g/mol

Therefore, the molecular mass of the gas sample is approximately 28 g/mol.