Question

The correct decimal representation of 6.453 × 103 is:The correct decimal representation of 6.453 103 is:6.5 × 1036.4530.0064536,453none of the aboveThe correct decimal representation of 1.201 × 10-7 is:The correct decimal representation of 1.201 10-7 is:1201.0000.00000012010.000120112010000none of the aboveThe wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation.The wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation.0.45 × 10−7 m4.5 × 106 m4.5 × 10−6 m4.5 × 107 m4.5 × 10−7 mThe distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation.The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation.0.172 × 10−10 m1.72 ×10−9 m1.72 × 1010 m1.72 × 10−10 m17.2 × 109 mPart AWhat is the mass in grams of 17.96 mL of acetone?Express your answer to four significant figures and include the appropriate units.Part BWhat is the volume in milliliters of 7.40 g of acetone?Express your answer to three significant figures and include the appropriate units.

Answer 1

Part A:

Given:

The volume of acetone, V=17.96 mL.

We know, the density of acetone is D=0.7900 g/mL.

Now, the mass of acetone is,

`\begin{gathered} M=VD \\ =17.96mL*0.7900\text{ g/mL} \\ =14.19\text{ g} \end{gathered}`

Therefore, the mass in grams of acetone upto four significant figures is 14.19g.

Part B.

Given:

The mass of acetone, M=7.40 g.

The volume is,

`\begin{gathered} V=(M)/(D) \\ =\frac{7.40\text{ g}}{0.7900\text{ g/mL}} \\ =9.37\text{ mL} \end{gathered}`

Therefore, the volume in mL upto three significant figures is is 9.37 mL