A 3.8-mole sample of an ideal gas is gently heated at a constant temperature of 340 K. The gas expands to 2.3 times its initial volume. What is the change in the internal energy of the gas? Let the ideal-gas constant R=8.314 (mol x K)

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass