How much energy is needed to raise the temp. of 24.5g Al from 50 to 71 Celsius?

If two atoms are bonded to a central atom with no lone pairs, how will they be arranged

What is the main reason why some developing countries fear the increase the free trade policies around the world?

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?