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what does conserving mass mean in a chemical equation?

1) there is an equal number of each type of atom on the reactant and product side.
2) there is an unequal number of each type of atom on both sides of the equation.
3) there are more of each type of atom on the product side than on the reactant side.
4) there are more of each type of atom on the reactant side than on the product side.

To a of 4 x hz is 1. 0. mm nm nm

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Abowling ball rolls 32 meters in 0.8 seconds what is the average speed in m/s of the bowling ball in m/s