30 POINTS PLS HELP Lexi is trying to cook a steak, but she has a problem! The 907g steak is frozen and at a temperature of 2.0C. She needs to get the steak to 63.0C in order for it to be safe to eat. How much energy does Lexi need to use? (The specific heat capacity of steak is 1.67 J/gC)

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?