The mass of Li2O : 104.58 grams
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Further explanation
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Given
3.5 moles of Li2O
Required
The mass
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
mol(n) = mass(m) : MW(molecular weight)
Input the value :
mass = mol x MW Li2O
mass = 3.5 mol x 29,88 g/mol
mass = 104.58 g grams
mass = 2.957 g
Ethanol contains an alcohol group (-OH), which includes hydrogen bonding. Hydrogen bonding is stronger than other IMFs such as Van der Waals forces and Dipole-Dipole.
Ethene only has Van der Waals forces as it is an alkene with only C-H or C-C bonds. These means that the forces are not as strong.
Since ethanol contains hydrogen bonding, it will take a higher temperature in order to break these bonds, and thus results in a higher boiling point than ethene.
The most appropriate answer is 'acetic acid contains a significant amount of carbon, but sodium hydroxide contains no carbon'. Organic compounds are those compounds that contains carbon atoms usually bonded to other elements such as oxygen, nitrogen and hydrogen. Organic compounds contain covalent single, double or even triple bonds.
<u>Answer</u>:
mass of magnesium oxide is 4.2 grams.
<u>Explanation</u>:
Balanced equation: 2Mg + O2 → 2MgO.
Given that 2.5 g Mg reacts with 3.0 g O2
- mass = moles * Mr
- moles = mass/Mr
- Mr = mass/moles
First find the moles of Mg:
moles = mass/Mr
moles = 2.5/ 24
moles = 0.104 moles
Using molar ratio, magnesium oxide will have same moles as Mg as they both have "2" molar ratio. So moles of Mg is 0.104 moles.
mass = moles * Mr
mass = 0.104 * 40
mass - 4.1667 g
mass = 4.2 g ___________this is the mass of MgO
Answer:
Explanation:
The area of a telescope lens is 6.668 × 10³ mm²
We need to convert the area in ft².
We know that,
It means,
or
So, the required answer is .