How many grams of solute do you have to weigh to prepare 250 ml KMnO4 solution with a concentration of 0.500 mol / L
Answer:
19.75g
Explanation:
Given parameters:
Volume of KMnO₄ = 250mL or 0.25L
Concentration of solution = 0.5mol/L
Unknown:
Mass of solute or KMnO₄ = ?
Solution:
To solve this problem, we need to find the number of moles first.
Number of moles = Concentration x volume
Number of moles = 0.5mol/L x 0.25L = 0.125mol
So;
Mass in grams = number of moles x molar mass
Molar mass of KMnO₄ = 39 + 55 + 4(16) = 158g/mol
Mass in grams = 0.125 x 158 = 19.75g
Charles law gives the relationship between volume of gas and temperature.
It states that for a fixed amount of gas at constant pressure, volume of gas is directly proportional to the temperature.

where V - volume and T - temperature and k - constant

where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in Kelvin , -206.6 °C + 273.15 = 66.55 K
T2 - 175.9 °C + 273.15 = 449.05 K
substituting the values in the equation

V = 782 mL
the new volume is 782 mL
GROUNDWATER is the term used for water that soak into the ground, fills the openings in the soil and trickles into cracks and spaces in rock layers.
Groundwater is usually found underneath the earth surface in the spaces and cracks in sand, rock and soil. It is stored in aquifers. Ground water usually connect with various water bodies such as oceans, rivers and streams and it is always a natural source of water for vegetation. Ground water is a very important natural resource.
Answer:
A potential
Explanation:
potential energy is a kind of energy which rest or stays in one position
Answer:
U shaped vallies?
Explanation:
(i dont know if this was one of the options)