Kyra wants to measure the volume of her key. She fills her empty graduated cylinder with 10 mL of water. After adding the key, the water level reads 23 mL. What is the volume of the key?

If a 12-v battery is connected to a circuit that has a current of 3.0 a, what is the total resistance in the circuit? 36 ohms 4 ohms 0.25 ohms

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

How many moles are contained in 5.6 l of h2 at stp