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Naya [18.7K]
2 years ago
13

Terence has studied the life cycle of frogs. He is curious and wants to find out what happens to a frog during the four seasons

of the year. He has found a pond with many frogs living in it in the summer. What should Terence do to find out what happens to the frogs for the rest of the year? Terence should ______.
keep visiting the pond throughout the rest of the year and record his observations


visit the pond after it has iced over in the winter and find the frogs


gather insects and feed the frogs all year long


count how many ponds there are in the area that have frogs and record his observations
Chemistry
1 answer:
yKpoI14uk [10]2 years ago
3 0

Answer:

do the first one to see what the frogs do in the winter(sleep) and other seasons(eat and mate)

Explanation:

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Answer:

0.15g

Explanation:

Given parameters:

Number of molecules of water = 1.2 x 10²¹ molecules

Unknown:

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Solution:

To solve this problem, we have to work from the known to the unknown specie;

             SnO₂   +    2H₂    →   Sn  +   2H₂O

Ensure that the equation given is balanced;

       

Now,

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                  6.02 x 10²³ molecules of water  = 1 mole

                   1.2 x 10²¹ molecules of water  = \frac{1.2 x 10^{21} }{6.02 x 10^{23} }    = 0.2 x 10⁻²moles

Number of moles of water  = 0.002moles

           From the balanced chemical equation:

         

             2 mole of water is produced from 1 mole of    SnO₂  

           0.002 moles of water will be produced from \frac{0.002}{2}  = 0.001moles

To find the mass;

           Mass  = number of moles x molar mass

Molar mass of  SnO₂ = 118.7 + 2(16) = 150.7g/mol

        Mass  =  0.001 x 150.7 = 0.15g

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