A particular radioactive isotope has a half-life of (2.50+a) hours. if you have (24.5+b) g of the isotope at 10:00 am, how much will you have at 7:30pm? give your answer in grams (g) and with 3 significant figures.

A primary consumer is an organism that would eat Select one: A. grasshoppers. B. fish. C. plants. D. mice.

Liquid butane, C4H10, is stored in cylinders to be used as a fuel. Suppose 35.5 g of butane gas is removed from a cylinder. How much heat must be provided to vaporize this much gas? The heat of vaporization of butane is 21.3 kJ/mol.

What are the three states in which most matter occurs

Enter your answer in the provided box. how many degrees of unsaturation are present in c7h8o?

Calculate the mass of chromium found in 2.50g sample of stainless steel

Consider two equal size rooms connected by an open door. One room is maintained at a higher temperature then the other one. Which room contains more air molecules? Explain.

When and how was benzene first used

How does magnification occur in an electron microscope?

What does Earth's crust consist of?

A neutral solution of a salt in water contains fewer H30 + ions than OH' ions more H3O + ions than OH ions an equal number of H30 + ions and OH' ions neither H30 + ions nor OH ions 4.