URGENT HELP, ON A TEST RIGHT NOW. 25 POINTS 1. Calculate the number of moles

2.Calculate the mass in grams of:

3.In each of the following quantities of matter calculate:

4.A molecule composed of carbon C and chlorine Cl has a molecular mass of 154 u. Knowing that

the carbon atom has an atomic mass of 12 u and that there is only one in the molecule,

determines the brute formula of the molecule

5.A molecule composed of carbon C and chlorine Cl has a molecular mass of 154 u. Knowing that

the carbon atom has an atomic mass of 12 u and that there is only one in the molecule,

determines the brute formula of the molecule

6.Calculate the molar concentration of 500 mL of a solution containing 1.5 g of HCl

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

How does climate change cause the ocean's thermohaline current to slow down?