Joseph Proust's Law of Definite Proportions state that each compound is composed of exactly the same proportion of elements by mass. This law is independent of how much of the compound is used. For example, water is composed of hydrogen and water. If you take the mass percentages of the two elements, hydrogen will always be 1/9 of water's mass, while oxygen will always be 8/9 of water's mass.
This law helped shape Dalton's work on the Law of Multiple Proportions which states that several compounds can contain the same group of elements. The ratios of the elements' masses in the compounds are always whole numbers.
Neutrons
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From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume occupied, n = number of moles of gas, R = universal gas constant=0.082L atm mol-1 K-1 and T = temperature.
Given: P = 2.8 atm, V = 98 l and T = 292 k.
Therefore n =
=
= 11.46
Answer:
The wavelength of the light passing through it. (Ans B).
Explanation:
The refractive index of a substance is defined as the ratio of the speed of the light present in the vacuum to the speed in the medium. Refractive index of a substance is called as a dimensionless number that helps to describe how fast light will travel through the substance. It is described as:
N = C/V,
Where C is known for the speed of the light in vacuum, and V is known as the phase velocity of light which is found in medium.
It is b because I'm just going around the house with me to the mall to get u at the moment I don't have any plans tonight or naw