The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole.  How many carbon atoms are in 1.00 g of butane? Express the number of atoms to three significant figures.

Silane, SiH4, is prepared according to the following equations: Si(s)  +  3 HCl(g)  →  HSiCl3(l)  +  H2(g) 4 HSiCl3(l)  →  SiH4(g)  +  3 SiCl4(l) If you use 2.51 moles of solid silicon, how many moles of silane can you obtain? Your answer should have 3 significant figures.

Safrole, one of the flavor molecules in sassafras, contains only C, H, and O. Combustion of 10.0 g of safrole produces 27.13 g of CO₂ and 5.555 g of H₂O. Determine the molar mass of the compound if it is between 150.0 and 220.0 g/mol. Provide an answer to four significant figures.

What is the mass of 7.10 moles of magnesium chloride, MgCl2? Express your answer with the appropriate units. How many moles of nitrogen, N, are in 77.0 g of nitrous oxide, N2O? Express your answer with the appropriate units.

The mass of 2.21 x 1040 atoms of iron (molar mass = 55.845 g/mol) is 2.78 x 104 g. 2.05 x 102 g 30.97 g. O 6.22 x 103g O 112 × 10-2 g.

A chemist prepares a solution of iron (II) chloride (FeCl₂) by measuring out 1.0 g of FeCl₂ into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Canions in the chemist's solution. Be sure your answer is rounded to 2 significant digits. 7 mol L 0x x10 X Ś

What is the mass of 3.5 x 10^-3 molecules of copper (II) carbonate? Use correct significant figures and units.

1.) What is the molar mass for aluminum sulfate? Please use the atomic masses on the periodic table. Express your answer with the correct significant figures and units for molar mass. Mass Choices:  123.05 342.17 6.02 x 10^23 273.08 Unit Choices:  mol mol/g g g/mol 2.) How many grams are there in 5.699 moles of copper, Cu?  Express your answer with the appropriate significant figures and units.  0.08968 g/mol Cu 362.2 g/mol Cu 362.2 g Cu 0.08968 g Cu

A chemist prepares a solution of potassium bromide (KBr) by measuring out 31. mg of KBr into a 100. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to the correct number of significant digits. alo mol L

Calculate the mass in grams of 3.00 x 1024 molecules of methanol. The chemical formula for methanol is CH,O. mass: + TOOLS X10