Acomet takes 4 hours to cruise 200,000 kilometers through the solar system. why can't we determine the velocity of the comet?

we can't figure out the comet's speed.

we don't know the comet's direction.

we don't know how the comet got there.

we don't know how far the comet traveled.

We don't know the comet's direction.

please mark brainliest.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.