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k0ka [10]
3 years ago
10

Speed is the ratio of the distance an object moves from a reference point to

Chemistry
1 answer:
Vladimir [108]3 years ago
4 0

The correct option is A.

Speed is the ratio of the distance an object moves from a reference point to  the amount of time it takes to travel the distance.

For a fixed distance, if the time required to travel the distance is less than the speed is high. However, if time to cover the same amount of distance is more than the speed is low. Therefore, the measurement of speed distance and time has an inverse relationship.


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Answer: 7.7\times 10^{22} molecules of Ba(OH)_2

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To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{21.9g}{171g/mol}=0.128moles

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0.128 mole of Ba(OH)_2 contains =  \frac{6.023\times 10^{23}}{1}\times 0.128=7.71\times 10^{22} molecules

Thus there are 7.7\times 10^{22} molecules of Ba(OH)_2

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