Which statement is TRUE about balancing chemical equations? to balance an equation, you have to change the subscripts
you can add coefficients to the middle of chemical formulas to balance
equations
you change coefficients in front of formulas or symbols to balance equations
balancing equations has nothing to do with the law of conservation of mass
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You can add coefficients to the middle of chemical formulas to balance

equations

Explanation:

The other three statements are all wrong.

The first statement says you can change the formula of a compound to balance the chemical equation, which is totally wrong.

The third statement is partially correct; you can change coefficients in front of formulas, but you can't change the coefficients in front of symbols. For example, you can't change Ca²⁺ to Ca³⁺ just to balance an equation. These things cannot be changed ever.

The fourth statement is also wrong because conservation of mass is the reason you're balancing the equation in the first place. You balance equations just to make sure there are equal numbers of atoms and/or compound molecules in both sides of the equation. If balancing equations had nothing to do with conservation of mass, then we would not need to balance equations at all.

they are both synthetic elements

explanation:

d

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :