- What mass of N2O contains 0.50 mol of nitrogen atoms? Pleas help having trouble with this problem .?

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A truck moves away from you. If its horn has an actual frequency of 475 Hz what frequency would you hear as it moves away at 20 m/s? Could all of Canada fit in Montana? Two edges of a isosceles triangle are: A(2,-2) and B(6,0). Its area is A=20 cm^2. Edge C=? Card number? Need help answering this math problem.?