Answer:
Explanation:
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In this case, according to the given chemical reaction, it is possible to calculate the enthalpy change of the reaction via:
Since the enthalpy of formation of oxygen is 0. Thus, given the enthalpies of formation of gaseous carbon dioxide and water, we obtain:
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If 4 moles of P is used by 5 mole of O2
then....0.489 moles will be used by 5/4 × .489 = .611 moles of O2
so .611 moles
so if 4 moles of P is burnt , 1 mole of P4O10 is produced ....so for .489 moles...... .489/4=.122 moles !
so mass will be .122× 283.89 = 34.7 grams
so first ans is .611 moles and second is 34.7 grams !
if you have any problem regarding this , just comment !!!
The reaction of formation of NH₃ is as follows;
N₂ + 3H₂ ---> 2NH₃
the stoichiometry of H₂ to NH₃ is 3:2
for every 3 moles of H₂ that reacts, 2 moles of NH₃ are produced
the mass of H₂ that has been used up = 5.81 x 10⁻⁴ g
molar mass of H₂ = 2 g/mol
number of H₂ moles that were used up = 5.81 x 10⁻⁴ g/ 2 g/mol
= 2.905 x 10⁻⁴ mol
for every 3 mol of H₂ used up - 2 moles of NH₃
for every 1 mol of H₂ used up - 2/3 moles of NH₃
therefore for 2.905 x 10⁻⁴ mol of H₂ = 2/3 x 2.905 x 10⁻⁴ mol
number of NH₃ moles produced = 1.94 x 10⁻⁴ mol
number of NH₃ molecules in 1 mole = 6.022 x 10²³ molecules
therefore in 1.94 x 10⁻⁴ mol = 6.022 x 10²³ molecules/mole x 1.94 x 10⁻⁴ mol
therefore number of NH₃ molecules produced = 1.168 x 10²⁰ NH₃ molecules
True
True
Explanation:
An ore is piece of rock that contains a large amount of metal. Ores are rocks that are made up of aggregate of metalliferous minerals and gangues from minerals can be won at profit.
Ores are vital for economic and political consideration. They are natural sources of resources which can be found in geological formations.
Ores are often used anonymously with aggregates of metals and gangues from which the metals can be won.
Examples are hematite, ore of iron
Cassiterite ore of tin
Most minerals comes from rocks that are mined from the earth crust is true.
A rock can be defined as an aggregate of minerals. In the formation of a rock, several minerals combine together naturally to form the mass. The bulk of the minerals on the earth crust are referred to as silicate minerals. Some rock forming minerals are:
- Olivine
- Pyroxene
- Quartz
- feldspars
Some rocks are also mined for their economic purposes and they are called ores.
Learn more:
Rocks brainly.com/question/2817889
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