<u>Answer: </u>The correct answer is 1.32 mol 
<u>Explanation:</u>
For the reaction of lithium and hydrofluoric acid, the equation follows:
By Stoichiometry of the reaction:
if 2 moles of lithium is producing 1 mole of hydrogen gas,
Then, 3.50 moles of lithium will produce = 
of hydrogen gas.
- Now, to know the theoretical yield of hydrogen gas, we use the equation:
...(1)
Moles of hydrogen gas = 1.75 mol
Molar mass of hydrogen gas = 2 g/mol
Putting values in above equation, we get:
- To calculate the percentage yield, we use the equation:
Percentage yield = 75.5 %
Theoretical yield = 3.5 g
Putting values in above equation, we get:
- Now, calculating the moles of hydrogen gas, we put the value in equation 1, we get:
Hence, the correct answer is 1.32 mol
Heart arteries lungs capillaries veins heart
In the amtmosphere this water vapor cools and turns back to liquid for forming clouds
this process is called condensation. When it cant hold on much longer it will turn into rain or snow.
Yellow paint has 0.511 % PbCrO4 by mass
Mass of PbCrO4 in 1 kg of paint = (0.511 / 100) * 1 kg = 0.00511 kg = 5.11 g
Moles of PbCrO4 = 5.11 g/ 323.19 g/mol
= 0.0158 moles
Moles of K2CrO4 also = 0.0158 moles
Moles of FeCr2O4 = 0.0158 moles K2CrO4 * (4 mole FeCr2O4 / 8 moles K2CrO4)
= 0.0079 moles
Mass of FeCr2O4 (chromite) = 0.0079 moles * 223.83 g/mol
= 1.77 g
Paint is a colored liquid, liquefiable, or solid mastic composition that transforms into a thin solid film after being applied to a substrate. Most commonly used for protection, coloring, or adding texture. Paints come in a variety of colors and can be made in a variety of ways.
Paint consists of pigments, solvents, resins, and various additives. Pigments give the paint its color. Solvents make application easier. The resin helps dry. Additives range from fillers to antifungal agents. There are hundreds of different natural and synthetic pigments.
Learn more about paint here
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