How many moles of H2 would be contained in 4.0 L of the gas at 202.6 kPa and 127°C?

What is the ionic charge for selenium

In your own words, explain the rules for multiplication and division with significant figures

Nitrogen-14 and nitrogen-15 are isotopes of the same element. How do these two isotopes differ?

A solution is tested with phenolphthalein and reveals a pink color. Which is a possible pH of this solution? * 1.4 2.7 3.1 4.10

Which two bases pair with each other?

For an atom's electrons, how many energy sublevels are present in the principal energy level n = 4?

Attempt 2 A sample of gas contains 49.16 % N 2 gas, 19.85 % Br 2 gas, 9.95 % CO 2 gas, and 21.04 % of an unknown gas. The average atomic mass of the gas mixture is 50.71 u. Calculate the atomic mass of the unknown gas.

A chemist determined by measurements that. 040 moles of gold participated in a chemical reaction. calculate the mass of gold that participated in the chemical reaction. round your answer to significant digits.

10) A screwdriver has the density of 5.5 grams per cubic centimeter. It also has the mass of 2.3 grams. What is the screwdriver's volume?

A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out