Astronomy- Question 2
1 pts
An alien spaceship travels in a straight line for 10kpc, and then for 3000lyr. How far has it travelled
in total, in km?

A. 3 x 10 to the exponent 20
B. 3.37x10 to the exponent 17
C. 1.87x10 to the exponent 17
D. 2.87x10 to the exponent 16

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)