The four data sets below represent the position (p) and time (t) of four different objects. Which data set describes the fastest-moving object?
p (m)
p (m)
p (m)
p (m)
Data Set A
t(s)
0 4.0
1 4.0
2 4.0
3 4.0
4 4.0
5 4.0
6 4.0
Data Set B
t(s)
0 25
1 20
2 15
3 10
4 5
5 0
6 -5
Data Set C
t(s)
0
0
1 4
2 8
3 12
4 16
5 20
6 24
Data Set D
t(s)
0 24
1 20
2 16
3 12
4 8
5 4
6 0
OB
OD
ОА

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  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

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