The average weighted atomic mass of magnesium is 24.305 amu. If the percent abundance of Mg-22 with an atomic mass of 22.445 amu is 18.30%, what is the atomic mass of the other isotope that is most common in nature?

Nonpoint source pollution is difficult to control because it

Balance and in which category does it fit in? single or double displacement or synthesis or decomposition? (a) k2 o → k + o2 (b) na + i2 → nai (c) cu(no3 )2 + naoh → cu(oh)2 + nano3 (d) kclo3 → kcl + o2 (e) ca(no3 )2 + hbr → cabr2 + hno3 (f) sn(oh)2 → sno + h2 o (g) p4 + n2 o → p4 o6 + n2 (h) fe + al2 (so4 )3 → feso4 + al (i) alcl3 + na2 co3 → al2 (co3 )3 + nacl (j) c3 h6 + o2 → co2 + h2 o

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device