Arsenic-80 will undergo beta minus decay. What will the new atomic number be?

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?

F1.5 mol of nabh4 react, how many moles of b2h6 are formed? 2 nabh4(aq) + h2so4(aq) → 2 h2(g) + na2so4(aq) + b2h6(g)