What is the percentage of water in the hydrate CoCl2 • 6H2O? Can someone help me with this one?
Answers
The RMM for the whole molecule is:
58.933 + (2 x 35.453) + (12 x 1.008) + (6 x 15.9994) = 237.96
Then you work out the RMM for water:
(2 x 1.008) + 15.9994 = 18.0154
As there are 6 moles of water in this molecule then multiply the RMM of H2O by 6 = 108.0924
Finally, divide the total H2O RMM by the total molecule RMM and multiply by 100 to get a percentage:
(108.0925 / 237.96) x 100 = 45.42%
Related Questions
What is the total number of moles of oxygen atoms present in 1 mole of mg(c1o3)2
You submerge a piece of clay in water and measure the total volume. You change the shape of the clay and put it back into the same amount of water. Does the mass change? Explain. ANSWER FAST
You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 69 quibs of a substance called skvarnick. You can trade this Skvarnick for gold coins, but the vendors all measure skvarnick units of sleps; not quibs. 9 sleps is equal to 6 quibs. If you have 14 quibs of skvarnick, how many sleps do you have? Round your answer to the nearest tenth (one decimal place). Type only the number; not the number and unit.
You are given an unknown liquid that has a density of 0.98 g/mL. It's volume is 39.63 mL. What is the mass of the unknown liquid?
precipitation
perception
Answers
Watering isn't the right term.
Perception is seeing something.
Answer:
Precipitation
Explanation:
Answers
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
hope it helps, please mark as brainliest
Answers
Answer:
A body of air with horizontally uniform temperature, humidity, and pressure.
Explanation:
hope this helped :)
An
yedsdfsdfdsfsdfsd f sdf ssdf sdfsdf sd fsdf sd
Explanation:
(1) 46 g (3) 85 g
(2) 61 g (4) 126 g
Answers
The answer is 46 g
The explanation :
According to the attached curve of the relation between the temperature and the grams in solutions:
-we can see from the curve that the grams of NaNO3 at 60°C = 126 g
-and the grams of NaNO3 at 10°C = 80 g
-so, To get the grams of NaNO3 settled out of the original solution, we will subtract the grams of NaNO3 at 10°C - the grams of NaNO3 at 60°C
126 g - 80 g = 46 g
∴ the correct answer is 46 g
(2) the activation energy of the exothermic reaction
(3) the difference between the potential energy of the products and the potential energy of the reactants
(4) the sum of the potential energy of the products and the potential energy of the reactants
Answers
Answer: The correct answer is Option 3.
Explanation:
The net energy absorbed or released in a reaction is known as total enthalpy change of the reaction. It is designated as
It is defined as the difference between the total potential energy of the products and the total potential energy of the reactants. The equation for this is given by:
where,
= Total potential energy of the products
= Total potential energy of the reactants
Hence, the correct answer is Option 3.
Answers
Here’s how you solve the problem.Calculate the volume of the unit cell.
If the length of an edge of the cell is a, then V = a³.
V = (385 × 10⁻¹² m)³ = 5.71 × 10⁻²⁹ m³Use the density to calculate the mass of the unit cell (The density of TlCl is the same, no matter what volume of TlCl we have).
Mass = 5.71 × 10⁻²⁹ m³ × (7.00 g/1 cm³) × (100 cm/1 m)³ = 3.99 × 10⁻²² gUse the molar mass to convert grams to moles.
3.99 × 10⁻²² g × (1 mol/239.8 g) = 1.67 × 10 ⁻²⁴ molUse Avogadro’s number to calculate the number of formula units.
1.67 × 10 ⁻²⁴ mol × (6.022 × 10²³ formula units/1 mol) = 1.00 formula units
Therefore, 1 unit cell of TlCl contains 1 formula unit.
Final answer:
To determine the formula units in a unit cell, understand the type of the unit cell structure (simple cubic, body-centred cubic, or face-centred cubic) and apply the appropriate calculation for that type.
Explanation:
To determine the number of formula units in a unit cell, one must first understand what these terms mean. A unit cell is the smallest repeating unit of a crystal lattice. There exist several different types that affect formula unit arrangement and quantity, including simple cubic, body-centred cubic, and face-centred cubic.
A crystal lattice is a three-dimensional framework of atoms, ions, or molecules arranged in a repeating pattern. The formula unit is the lowest whole-number ratio of ions represented in an ionic compound. In a simple cubic unit cell, there's one formula unit, in a body-centred cubic cell, there are two, and in a face-centred cubic cell, there are four.
For instance, if you are dealing with a simple cubic arrangement the unit cell is composed of 8 atoms forming the vertices and each one is shared amongst 8 neighbouring cells, you have (8 x 1/8 = 1) formula unit per cell. Similarly, in a body-centred cubic, there is 1 atom in the centre fully inside, and 8 on the corners shared with neighbouring cells, hence (1 + 8 x 1/8 = 2) formula units per unit cell.
Learn more about Unit Cells and Formula Units here:
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