A chemist determined by measurements that 0.0650 moles of sodium participated in a chemical reaction. Calculate the mass of sodium that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Balance and in which category does it fit in? single or double displacement or synthesis or decomposition? (a) k2 o → k + o2 (b) na + i2 → nai (c) cu(no3 )2 + naoh → cu(oh)2 + nano3 (d) kclo3 → kcl + o2 (e) ca(no3 )2 + hbr → cabr2 + hno3 (f) sn(oh)2 → sno + h2 o (g) p4 + n2 o → p4 o6 + n2 (h) fe + al2 (so4 )3 → feso4 + al (i) alcl3 + na2 co3 → al2 (co3 )3 + nacl (j) c3 h6 + o2 → co2 + h2 o

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?