General Chemistry Answers

2H2 + O2 ⇌ 2H2O

What happens to the reaction when the temperature is decreased? (Which way is the reaction shifted?) and why.

If 200.0 g of an isotope decays to 25.0 g in 24.0 seconds, what is the half-life of this isotope?

The half-life of an isotope is 10.0 minutes. If 25.0 grams are left after 60.0 minutes, how many grams were in the original sample?

The half-life of radon-222 is 3.8 days. How much of a 100.o g sample is left after 15.2 days

The half-life of an isotope is 2.0 hours. How much of a 50.0 g sample is left after 6.0 hours?

5) if an amount of sodium contains 3.01 X10^23 atom, then the mass of this amount equals...... g (Na=23)

If 7.46 mg of a gas occupies 2899 mL at 849 mm Hg and 27.63°C, what is the molecular weight of the gas?

State the number of protons in a atom of N-15

What mass in kilograms of CO2 is needed to fill an 80.0 L tank to a pressure of 150.0 atm at 27.0 °C?

when we dissolve 5 moles of sodium carbonate in water the number of sodium ions moles in solution