A gas sample at STP occupies 60. liters. The temperature is increased to 273 °C and the pressure is decreased to 0.25 atm
a. Will the volume increase, decrease, or remain the same?
b. Calculate the new volume of the gas sample

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

so what is the problem with your lab report and whats the subject of the lab report? i will you