A person's heartbeat is 66 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does the person live? Disregard leap years.

The half life of 226/88 Ra is 1620 years. How much of a 12 g sample of 226/88 Ra will be left after 8 half lives?

Hf is a corrosive gas. at 2.0 atm and 300 k, hf occupies a 4.50 l volume. how many grams of hf are in the volume? 1. 7.3 g 2. 2.74 g 3. not enough information is given. 4. 0.573 g 5. 15.6 g 6. 4.82 g

A shallow river dries up is an example of Condensation Evaporation Precipitation Runoff

Which of the items below could scientists use to date a layer of rock? a raindrop on the rock a fossilized fish a green leaf that fell off of a tree an insect flying near the dig site

Atom tableTomic number mass number number of protons number of neutrons number of electrons symbol

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

How do I find the molar mass of Copper (II) Nitrate?

Describe several main ideas in chemistry

What is the wavelength of a wave having a frequency of 1.75*10^ 14 s^ - 1?

What alkene (s) would be produced from the dehydration of cyclopentanol?