Calculate the number of moles in 41.5 g of mgcl2

According to the tide table below what time of day will the highest tide occur?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

What is the relationship of air masses and the temperature of oceans?