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Round 129995 to four significant figures.        

Round the number  0.0607545 to four significant figures.   

Compute the following: Number of moles of copper in 254 g of copper[moles] Mass of 0.050 mol of copper[grams1] Mass of 1.81×1024 atoms of copper[grams2] Number of moles of copper in 2 moles of Cu3(PO4)2 [moles2]

The amount of phosphorus in an 85 kg person is approximately 0.9 kg. What is the weight of phosphorus in pounds?

Identify the period and the group number of each element Be  period[period1]group[group1] Se  period[period2]group[group2] Re  period[period3]group[group3] Fe  period[period4]group[group4] Ce  period[period5]group[group5]

Convert 12557 feet to meters. Round your answer to three significant figures.

The density of tungsten is 19.35 g/cm3. A sample of tungsten is placed in a graduated cylinder containing 16.1 mL of water and the water level rises to 23.6 mL. What is the mass in grams of the sample of tungsten?

Express the result of the following calculation in scientific notation: 563000 cm2 x 0.69 cm

Calculate the molar mass of calcium trichloroacetate, Ca (CCl3CO2)2, in g/mol

The mass of 450.5 mg equals