What is the charge on the anion in KNO2?

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Is 343 in the sequence -5, -2, 1, 4, 7