In 1928, 47.5 g of a new element was isolated from 660 kg of the ore molybdenite. the percent by mass of this element in the ore was:

The salts NaCl and CaCl2 (a) are good conductors of electricity (b) have positive charges (c) have the same crystal lattice of energy (d) are held together by ionic bond

Which of the following can be classified as a mixture

Pepsin is an enzyme involved in the process of digestion. Its molar mass is about 3.50 * 104 g/mol. What is the osmotic pressure in mm Hg at 30°C of a 0.500-g sample of pepsin in 60.0 mL of an aqueous solution?

What was technicalagy like in the past

Which of the following have the lowest density solids rocks liquids gases

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?

Given the following information, calculate the mass for B-11. B-10 has a natural abundance of 19.9 percent, while B-11 has a natural abundance of 80.1 percent. The mass of B-10 is 10.013 amu.

How many moles of oxygen react with 0.23 moles of NH3

How many moles of carbon do you have in 100 quadrillion carbon atoms? report answer to 2 sig figs