3. the relationship between the number of moles of the gas particle mass and volume. Know that there are a number of displaysyle 1 mol 6.02 x 10 ^ particle or mass is the Gram is {23} is equal to the atomic mass of the element or the molecular mass of the substance and if there are gas volume is equal to the STP desimet cube shows that 22.4 If the quantity of the substance that is 1 mol displaysyle MOL, such as He or the mole to NH_3 1 substance as other units of mass, volume, or number of particles is the substance. The example shown in Figure 4.3 From the following diagram can be used to calculate the number of moles of substance and volume number of particles have mass, as in the following example:For example, there are a number of 8-10 g of sulfur atoms compressed.Method 1. Step 1: change the mass to Mole Using the relation is 1 mole is equal to the atomic mass is the mass, GM has a factor changes the units of 1 mol sulfuric/mass is the Gram is equal to the atomic mass of sulfur, which is 32 ounces, so. mol S = displaysyle molS=10g
lap{--}S imesleft({frac{{1molS}}{{32g
lap{--}S}}}
ight)=0.3125mol Step 2: change the mole, atomic number Using the relation is 1 mol 6.02 x 10 ^ displaysyle is the number of atoms, so the factors change {23} units x 10 ^ displaysyle 6.02 sulfur atoms 1 mol of sulfur {23}/so. displaysyle atomS = 0.3125
lap{--} m
lap{--} o
lap{--} l
lap{--} S imes left( {frac{{6.02 imes 10^{23} atomS}}{{1
lap{--} m
lap{--} o
lap{--} l
lap{--} S}}}
ight) = displaysyle 1.88 imes 10^{23} atom10 grams of sulfur has atomic displaysyle imes 10 ^ 1.88 {23}Method 2.Could do with step 1 and 2 are combined into a single step that?displaysyle atomS = 10
lap{--} g
lap{--} S imes left( {frac{{1
lap{--} m
lap{--} o
lap{--} l
lap{--} S}}{{32
lap{--} g
lap{--} S}}}
ight) imes left( {frac{{6.02 imes 1023atomS}}{{1
lap{--} m
lap{--} o
lap{--} l
lap{--} S}}}
ight) = displaysyle 1.88 imes 10^{23} atom10 grams of sulfur are displaysyle imes 10 ^ 1.88 Atomic {23} For example, nitrogen dioxide (NO2) gas 9 number of 1.51 × 1023 molecule has mass and volume at STP how much.1. the mass of NO2 Method 1. Step 1, change the number of molecules into moles. Using the relation is 1 mol 6.02 x 10 ^ displaysyle is the number of molecules so transition factor {23} units NO_2 displaysyle 1. MOL 6.02 x 10 ^ displaysyle/NO_2 {23} molecule, so.Mol displaysyle NO_2 = displaysyle 1.51 imes 10^{23}
lap{--} m
lap{--} o
lap{--} l
lap{--} c
lap{--} c
lap{--} u
lap{--} l
lap{--} e
lap{--} N
lap{--} O_2 imes left( {frac{{1molNO_2 }}{{6.02 imes 10^{23}
lap{--} m
lap{--} o
lap{--} l
lap{--} c
lap{--} c
lap{--} u
lap{--} l
lap{--} e
lap{--} N
lap{--} O_2 }}}
ight) = 0.2508 moldisplaysyle NO_2 Step 2: change the Mole as a mass. Using the relation is 1 mole is equal to mass, molecular mass is the gram. The factors change the unit used is the mass is the gram molecular mass of NO2 equivalent, that is, 46 g/1 mole NO2, so. = 11.53 g displaysyle NO_2Displaysyle imes 10 ^ {23} NO_2 1.51 molecule has mass 11.53 g. Method 2.A single step by multiplying the quantities by a factor that changes the unit in relation to continuous until the unit according to whether. = 11.53 g displaysyle NO_2Displaysyle imes 10 ^ {23} NO_2 1.51 molecule has mass 11.53 g.2 STP volume of NO_2) displaysyle Change the number of MOL displaysyle NO_2 from step 1, as the volume of gas at STP 1 mole relationship is with the volume at STP has 22.4 cubic desimet factor changes the units are dm ^ 3NO_2 displaysyle 22.4/1 mol displaysyle NO_2 so. 1.51 × 1023 molecules have volume NO2 5.62 cubic desimet at STP.
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