Party City sells helium-filled 4-liter Happy Birthday Mylar balloons. The temperature in the store is 293
K(about 68 degrees Fahrenheit). The balloon
contains 0.5 moles of helium gas. What will be the
pressure be in the balloon caused by the helium
molecules bouncing against the inside of the Mylar
balloon?

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.