How many electrons are present in a tin atom with a mass number of 119

When the water vapor cools it condenses select a number that represents his process on the

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ