Allie need to buy at least 12 candles plain candles sell for 4 each and scented candles sell for 7 each she can spend no more than 57

there were 9 plain candles and 3 scented candles.

Explanation:

Let she buys x candles for 4 each and buys y candles for 7 each.

Then According to the questions

x+y= 121

and

4x+7y= 572

solving 1 and 2 we get the values of x and y as 9 and 3 respectively.

So, there were 9 plain candles and 3 scented candles.

yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes

explanation:

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 :