The coefficients needed to balance the equation would be 2, 7, 4, and 6 respectively.
<h3>Balancing chemical equation</h3>
This requires that the number of atoms of each element is the same both on the reactant and product's sides.
Hence, the balanced equation of the reaction becomes:

Thus, the coefficient for each species would be 2, 7, 4, and 6 respectively.
More on balancing chemical equations can be found here: brainly.com/question/15052184
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All you have to do in convert two units. You need to know that there are 3600 seconds in an hour, and one kilometer is ~3,280.8399 feet. 3,280.8399 * 112 is equal to 367454.0688 feet per hour. Now divide it by 3600 to get it into seconds. That is equal to 102.07057466666667 feet per second. That's your answer.
D. A salt e.g NaCl is held by ionic bond
Answer:
B) A piece of metal in water and produces spark and gas