1. Imagine you have a sealed 20.0 L balloon filled with helium gas at 750 mmHg in the house at 25°C.
a. If you brought it outside on a winter day and its temperature dropped to -10°C.
Determine the volume of the balloon. Assume that the pressure in the balloon will stay
constant.

17.6510 L

Explanation:

First we should get the number of moles of helium here by Boyle's law

PV=nRT

P=750/760= 0.9868 atm

T=25+273=298 kelvin

R= 0.08206

V= 20L

so

n=PV/RT

n=0.9868×20/0.08206×298

n=0.80707 mol

Then use the same law

V=0.80707×0.08206×263/0.9869=

17.6510L

SO THE VOLUME WILL BE 17.6510 L

indium, and thallium have three electrons i think

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates