A cylindrical glass of water (H2O) has a radius of 6.12 cm and a height of 9.91 cm. The density of water is 1.00 g/cm3. How many moles of water are contained in the glass?
volume of cylinder is pi*r^2*h
mass H2O = volume x density
mols H2O = mass H2O/molar mass H2O
How Many Equivalent Of Solute Are Contained In 1L OF 2N solution?
#eq = N x L = ?
You would do well to post new questions at the top of the pager and not piggy back onto other questions. Most of the time those piggy-backed questions get lost in the shuffle.
To find the number of moles of water in the glass, you need to follow these steps:
Step 1: Calculate the volume of the cylindrical glass using the formula for the volume of a cylinder: V = π * r^2 * h.
Given:
Radius (r) = 6.12 cm
Height (h) = 9.91 cm
Using the given values in the formula, we get:
V = π * (6.12 cm)^2 * 9.91 cm
Step 2: Convert the volume from cubic centimeters (cm^3) to liters (L) since 1 liter is equal to 1000 cm^3.
To do this, divide the volume by 1000:
V (in liters) = V (in cm^3) / 1000
Step 3: Use the fact that the density of water is 1.00 g/cm^3 to calculate the mass of water in grams (g).
Given:
Density of water (ρ) = 1.00 g/cm^3
Using the formula: Mass (m) = Density (ρ) * Volume (V), we have:
m (in grams) = ρ * V (in liters)
Step 4: Convert the mass from grams to moles using the molar mass of water.
The molar mass of water (H2O) is approximately 18.015 g/mol.
To find the number of moles, divide the mass by the molar mass:
Number of moles (n) = m (in grams) / Molar mass (M)
Substituting the values, we get:
Number of moles = m (in grams) / 18.015 g/mol
By following these steps, you can find the number of moles of water contained in the glass.