How many helium atoms are in a helium blimp containing 498 kg of helium?

Explain how neurotransmitters work.

If 0.2 M Ag+, 2 M Ba2+, and 2 M Ca2 + are added to a Na2SO4 solution, which will precipitate first? (Ksp of Ag2SO4 = 1.4 x 10-5, Ksp of BaSO4 = 1.1 x 10-10, and Ksp of CaSO4 = 9.1 x 10-6) A.) BaSO4 B.) Ag2SO4 C.) BaSO4 and CaSO4 D.) Ag2SO4 and CaSO4

How many atoms are in 2.70 moles of iron (Fe) atoms? 4.48 * 10-24 atoms Fe 1.63 * 1024 atoms Fe 2.23 * 1023 atoms Fe 6.02 * 1023 atoms Fe

How many moles of NaCi are equivalent to 15.6

Which has a higher frequency a neutron or electron

Which item takes the most amount of water to produce

1. Which of the following two ingredients can combine to make a compound? a. Salt and water b. Hydrogen and oxygen c. Eggs and butter d. Sugar and water 2.

What are two ways climate can influence weathering?

A light has a wavelength of 4.10*10^12m. What is the Frequency?

If a compound has a molar más of 180g/mol and it's empirical formula is CH^2O, what is it's molecular formula?