500mL de uma solução 0,2 mol. L-1 de NaCl são misturadas com 200mL de uma solução 0,6 mol. L-1 de KCl. As concentrações, em mol/L, da solução resultante em relação aos íons Na+, K+ e Cl- são respectivamente: A) 0,125; 0,136; e 0,260
B) 0,301; 0,142; e 0,443
C) 0,142; 0,171; e 0,313
D) 0,201; 0,163; e 0,364

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

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?