Elements with the same number of electron shells are in the same

How many grams of n2h4 will be consumed by 23 g of n2o4

In which of these cases are the two wave points considered to be in phase with each other?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.