87 g of oxygen gas would occupy how many liters of volume at stp

1. 5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.092 cal/g °C) show work

How much heat is required to increase the temperature of 198.5 grams of water from 25.0 degrees Celsius

At constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 l to 3.00 l, with no change in moles or temperature. what was the new pressure exerted by the helium on its container?

How can a mixture of ammonia and hydrogen be seperated?

Which of the following is likely to occur if more reactants are added to a reaction that is at chemical equilibrium?

Which of the following is an example of an electric force that occurs in atoms

5. What is another name for Newton's first law in your own words.

The molar mass of magnesium (Mg) is 24.30 g/mol. There are 6.02 1023 atoms in 1 mol. How many atoms are present in 48.60 g of Mg? 3.32 10^-24 atoms 1.96 10^-21 atoms 1.20 10^24 atoms 7.11 10^26 atoms

Add 3.76 * 104 and 5.5 * 102 and write the answer in scientific notation. A. 9.26 * 104 B. 9.26 * 106 C. 3.82 * 106 D. 3.82 * 104

In a dynamic equilibrium between the liquid state and the gas state, what is true about the rate of evaporation? a. greater than rate of condensation b. less than rate of condensation c. equal to rate of condensation d. cannot be determined.