How to find how many grams of nitrogen would fill 240 L

The problem says how many grams of nitrogen would fill a 240 L weather balloon to a pressure of 1.25 ATM at 29 degrees C

how to do scientific notation

how to write 1,030,000 in scientific notation

what's the easiest way to balance chemical equations?

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how do I work out the problem x/-7 +9 = 6

I do not remember how to do the operations to solve these types of equations... x/-7 + 9 = 6 and the problem x/-4 + (-7) = (-16). what is the difference and how do you work them out?

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