How to convert particles to mass

Liquid nitrogen is very cold. At room tempature it changes into a gas. This is an example of: A) Evaporation B) Sublimation C) Melting D) Boling (Its not answer b)

What is 63g+9cm density

Where does the peak intensity need to fall on the spectrum for a very intense star? Ultra-violet range Infrared range Visible range Gamma range

Use the term that means "a change in velocity" in a complete sentence

A sample of 51.0 g of ammonia was reacted with excess copper oxide. How many moles of nitrogen would be produced? 2NH₃ (g) + 3CuO (s) → 3Cu (s) + 3H₂O (l) + N₂ (g) A. 1.0 mole B. 1.5 mole C. 2.0 mole D. 2.5 mole

What volume of carbon dioxide measured at STP will be formed by the reaction of 1.42 mol of oxygen with 0.900 mol of ethyl alcohol?

Substance A and substance B were dissolved in two separate 100 mL beakers of water, which each started at a temperature of 25.1°C. The mixtures' temperatures were measured and recorded as shown in the table below. Substance Initial Temp. Final Temp.

Jaina just got home from a difficult workout. She is complaining of muscle soreness and cramps. Which waste product of fermentation caused the soreness and cramps?

Balance equation C5H10+O2=CO2+H2O

The Scott Test is used when which drug is suspected?