What is the first element of the periodic table

What is the mass percent of sodium chloride in a solution in which 50 grams of NaCl is dissolved in 700 grams of water?

How many grams of NH3 are needed to provide the same number of molecules as in 0.15 grams of SF6

If heat flows into a system and the system does work on the surroundings, what will be the signs on q and w? Select the correct answer below O positive q, positive w O positive q, negative w O negative q, positive w O negative q, negative w

I need to clean the Kwik Switch thermometer between each measurement. O True False

What is the kw of pure water at 50.0°c, if the ph is 6.630? 5.50 * 10-14 2.13 * 10-14 1.00 * 10-14 2.34 * 10-7 there is not enough information to calculate the kw?

Consider the reaction: 8H2S (g) + 4O2 (g) →8H2O (g) + S8 (g). Δ[H2S]/Δt = - 0.033M/s. Find Δ[O2]/Δt. Δ[H2O]/Δt. Δ[S8]/Δt. Find the rate of the reaction.

At room temperature and pressure what is the volume of one mole of oxygen?

Ibuprofen, a common pain remedy, has an empirical formula of C7H9O and a molar mass of approximately 218.078 grams per mole. What is the molecular formula of ibuprofen?

Copper (cu) is a transition element used in the making of coins. calculate the mass in grams of 0.0420

In 1864, the Solvay process was developed to make soda ash. One step in the process is represented by the balanced equation below.