PLEASE PLEASE PLEAS I NEED HELP!
if the half-life of substance z is 2.5 years, how long would it take dor 48 grams of substance z to decay such that only 3 grams remain?
if you are willing i need help on more questions and ill give you brainliest if you do!!

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)

What is the correct lewis dot structure for arsenic?