15. 20g of marble containing 90% CaCO3 is allowed to react with 50g of a concentrated acid containing 36.5% HCl by mass. Find, a) Limiting reactant b) Number of mole of excess reagent left over unreacted c) Mass of salt in gram d) Volume of CO2 gas liberated at NTP. ​

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

Plzz a sample of table sugar (sucrose, c12h22o11) has a mass of 7.801 g. ● a) calculate the number of moles of c12h22o11 in the sample b) calculate the number of moles of each element in c12h22o11 (number of moles of c, number of moles of h & number of moles of o) in the sample. (use your answer from part a as your starting point.) show your work and highlight your final answer. calculate the number of atoms of each element in c12h22o11 (number of atoms of c, number of atoms of h & number of atoms of o) in the sample. (use your answers from part b as your starting for each element.) show your work and highlight your final answer.

Which of the following is true about the speed of light? it depends on the wavelength.