Answer: Option (c) is the correct answer.
Explanation:
An equation will be balanced when both number of reactants and products are equal.
The given equation is as follows.
![NaOH + H_{3}PO_{4} \rightarrow H_{2}O + Na_{3}PO_{4}](https://tex.z-dn.net/?f=NaOH%20%2B%20H_%7B3%7DPO_%7B4%7D%20%5Crightarrow%20H_%7B2%7DO%20%2B%20Na_%7B3%7DPO_%7B4%7D)
Number of reactants are as follows.
Number of reactants are as follows.
To balance the equation, multiply NaOH on the reactant side by 3 and
on the product side by 3.
Therefore, the equation will be as follows.
![3NaOH + H_{3}PO_{4} \rightarrow 3H_{2}O + Na_{3}PO_{4}](https://tex.z-dn.net/?f=3NaOH%20%2B%20H_%7B3%7DPO_%7B4%7D%20%5Crightarrow%203H_%7B2%7DO%20%2B%20Na_%7B3%7DPO_%7B4%7D)
The coefficient in front of NaOH is 3.
The patch area in square kilometers is 1.59*10⁻⁹ km₂
Why?
This is an unit conversion problem. We have to convert from cm² to km². We can do that by knowing that there are 100 cm in 1 m, and 1000 m in 1 km, so 100000 cm=1km. Knowing that we can apply the following conversion factor:
![15.9 cm^{2} * (\frac{1 km}{100000 cm} )^{2}=0.00000000159 km^{2}](https://tex.z-dn.net/?f=15.9%20cm%5E%7B2%7D%20%2A%20%28%5Cfrac%7B1%20km%7D%7B100000%20cm%7D%20%29%5E%7B2%7D%3D0.00000000159%20km%5E%7B2%7D)
Now to convert this value to scientific notation, we have to move the decimal point to the right until we get a whole number, and the exponent of the number 10 is going to be the number of spaces we moved to the right (negative), so the final answer is:
![0.00000000159 km^{2}=1.59*10^{-9} km^{2}](https://tex.z-dn.net/?f=0.00000000159%20km%5E%7B2%7D%3D1.59%2A10%5E%7B-9%7D%20km%5E%7B2%7D)
Have a nice day!
#LearnwithBrainly
Answer:
Nope, not a chemical change.
Explanation:
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Very generally the snow storms occur over a much larger area than a thunderstorm and generally move much slower this is why it moves slow.
Answer: Because water has a high specific heat capacity due to the hydrogen bonding within the H₂O molecules ; so it takes a great deal of energy, or heat, to break these bonds— or to form them.
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