- How many moles of hydrogen are in a 23 gram sample of propane gas(C3H8)?

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Find the exact value of the expression: sin(sin^-1 2/3 + cos^-1 1/3)? My cursor won't move and the computer is locked. What do I do? Function W(d)=0.112d approximates the amount,in centimeters,of water that results from snow melting from depths of 16 cm, 25 cm and 100 cm? Has anyone ever found rocks from black earth? What are cows?