How are the sizes of stars measured?

I just need a simple answer

Why is it not possible to directly count the number of particles in a mole?

Why is it important that there is only a small amount of water in the beaker

What is the symbol for sodium chloride?

When 5.5490 * 108 is correctly rounded to three significant figures the number becomes

If the pressure of 125 l of gas is changed from 2.52 atm to 1.50 atm the new volume will be

Define density and erute the formula and units for calculating density

A student intended to make a salt solution with a concentration of 10.0 grams of solute per liter of solution. When the student's solution was analyzed, it was found to contain 8.90 grams of solute per liter of solution.

What value is the closest to the atomic mass of cerium? Isotope Percent Abundance 136Ce 0.185% 138Ce 0.251% 140Ce 88.450% 142Ce 11.114%

Which element could chlorine bond with to form an ionic compound? helium oxygen fluorine sodium

Given 4.8 moles of a gas in a 1.8 L container, if the temperature is found to be 31 degrees Celsius, what is the pressure of the gas? (The ideal gas constant is 0.0821 L · atm/mol · K and 1 atm = 760 torr.) 6.79 torr 66.55 torr 6.79 x 100 atm 6.