HELP ASAP PLEASEEEWhat is the percent composition, rounded to the nearest whole number for each element in sodium chloride (NaCl)?
ANSWER CHOICES INCLUDED IN IMAGE ABOVE

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Which description best characterizes the motion of particles in a solid?

The volume of a single vanadium atom is 9.29×10-24 cm3. what is the volume of a vanadium atom in microliters?