Molar mass is measured in units of what?

A student calculated that the amount of NaCl that should form in the lab (theoretical yield) is 2.50 grams. The actual amount formed was only 2.30 grams. How would you calculate the student's percent yield? A) 92% B) 0.92% C) 108% D) 1.08 %

A. Explain the difference between an exothermic chemical reaction and an endothermic chemical reaction. B. How is the enthalpy of reaction related to the enthalpies of formation for the products and reactants?

What is the partial pressure of the third gas, helium?

How to calculate the mass of solid sodium hydroxide needed to prepare 200 ml of a 0.040m solution. if one pellet of sodium hydroxide weighs 0.170g, how many pellets should be dissolved?

A gust of wind blowing east pushes against a ball. When will the wind do work on the ball? when the ball moves to the east when the ball moves to the north when the ball stays in one place when the ball moves north or south

What do scientists do during data collection? O A. Analyze information to form a summary B. Gather information during an experiment C. Observe and ask scientific questions O D. Design an experiment to test a hypothesis

Organic molecules always: A. contain carbon. B. contain carbon, hydrogen, and oxygen respectively in a 1:2:1 ratio. C. are produced by living organisms. D. dissolve in water.

Whats the scientific notation of 0.00000923

A catalyst increases the rate of a chemical reaction by

What energy is changed to cell energy in stage 1 of photosynthesis. true or false