The relative molecular mass of sodium hydroxide is 40. If 60g of sodium hydroxide are dissolved in water, how many moles will there be in the solution?

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

there's the proffessional site that will you.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.