4.8 gm of carbon no. of moles?​

What’s the percent by mass of carbon in c10h14n2

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system

Can someone me with 1 to 4 plz. fast