How many moles of a gas are present in a volume of 5.00l at 1.00atm and 298.15k?

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?