So, the answer would be 20 cm
Which phrase best defines a prototype? The final product, which has undergone extensive testing and redesign a model that has be
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The most accurately represented John Dalton's model of the atom is: C. a tiny, solid sphere with a predictable mass for a given element
<h3>Further explanation</h3>The development of atomic theory starts from the first term conveyed by Greek scientists who suggested that every substance has the smallest particles so that the word atomos appears, which means it cannot be divided. So, John Dalton, a British scientist put forward the hypothesis about atoms, among others:
- 1. The elements are composed of atoms which are small particles which cannot be subdivided
- 2. Atoms that make up the same element have the same properties, mass, and size, while for different elements, the properties are also different
- 3. Compounds are composed of two or more atoms in a fixed ratio
- 4. In chemical reactions, atoms after and before a reaction cannot be destroyed, only separation and reassembly occur
Point 3 shows the relationship with The Law of Constant Composition of Proust so that further research on atoms is more developed
Dalton's hypothesis is described as a solid sphere like a very small shot put ball or a bowling ball based on Dalton's hobby in bowling
<h3>Learn more</h3>Bohr's model of the atom
Rutherford performed the gold foil experiment
The part of an atom that is mostly empty space
Keywords: atom, Dalton, a solid sphere, The Law of Constant Composition
<u>Answer:</u> The empirical and molecular formula of chrysotile is and
<u>Explanation:</u>
We are given:
Percentage of Mg = 28.03 %
Percentage of Si = 21.60 %
Percentage of H = 1.16 %
Percentage of O = 49.21 %
Let the mass of compound be 100 g. So, percentages given are taken as mass.
Mass of Mg = 28.03 g
Mass of Si = 21.60 g
Mass of H = 1.16 g
Mass of O = 49.21 g
To formulate the empirical formula, we need to follow some steps:
- <u>Step 1:</u> Converting the given masses into moles.
Moles of Magnesium =
Moles of Silicon =
Moles of Hydrogen =
Moles of Oxygen =
- <u>Step 2:</u> Calculating the mole ratio of the given elements.
For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.752 moles.
For Magnesium =
For Silicon =
For Hydrogen =
For Oxygen =
To convert the mole ratios into whole numbers, we multiply individual mole ratios by 2
Mole ratio of Magnesium = (2 × 1.5) = 3
Mole ratio of Silicon = (2 × 1) = 2
Mole ratio of Hydrogen = (2 × 1.5) = 3
Mole ratio of Oxygen = (2 × 4) = 8
- <u>Step 3:</u> Taking the mole ratio as their subscripts.
The ratio of Mg : Si : H : O = 3 : 2 : 3 : 8
The empirical formula for the given compound is
For determining the molecular formula, we need to determine the valency which is multiplied by each element to get the molecular formula.
The equation used to calculate the valency is :
We are given:
Mass of molecular formula = 520.8 g/mol
Mass of empirical formula = [(24 × 3) + (28 × 2) + (1 × 3) + (16 × 8)] = 259 g/mol
Putting values in above equation, we get:
Multiplying this valency by the subscript of every element of empirical formula, we get:
Hence, the empirical and molecular formula of chrysotile is and