Given: sno2 + 2h2 → sn + 2h2o tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

4.2123 mol

First, calculate the no. of moles of Sn produced in the reaction. You can find this by dividing the mass of Sn produced by the atomic mass of Sn. You can find the atomic mass of Sn from the periodic table, usually it is the number at the bottom.

No. of moles of Sn produced = 500 / 118.7 = 4.2123 mol

From the equation, we can see that the mole ratio (the numbers in front of each substance) of SnO2 : Sn is 1:1, which means, 1 mole of SnO2 reacts to give out 1 mole of Sn, so, we can conclude that the no. of moles of SnO2 and Sn are the same.

Note that the no. of moles of SnO2 will be different if the mole ratio is not 1:1, for example, if the mole ratio are 1:2, which means 1 mole of SnO2 will give out 2 moles of Sn, so the no. of moles of SnO2 will be the no. of moles of Sn divided by 2.

But since the ratio for this reaction is 1:1, the no. of moles of SnO2 required will be 4.2123 mol as well.

chemical energy is stored in the chemical bonds of atoms and molecules. it can only be seen when it is released in a chemical reaction. when chemical energy is released, the substance from which the energy came is often changed into an entirely different substance.

this chemical reaction releases energy in the form of light and heat. chemical energy is the potential energy stored in the arrangement of atoms within molecules. breaking chemical bonds requires energy, while forming new chemical bonds releases energy.

the atp molecule can store energy in the form of a high energy phosphate bond joining the terminal phosphate group to the rest of the molecule. in this form,energy can be stored at one location, then moved from one part of the cell to another, where it can be released to drive other biochemical reactions.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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