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How many moles are represented by 4.0 grams of hydrogen peroxide (H2O2)? Use the conversion factor 1 mole = molar mass * grams or 1 mole/ # grams. Use the correct Units because they must cancel out. Use the significant figure rules to write your final answer.  example of how this should be set up is attached.

How many moles are represented by 4.0 grams of hydrogen peroxide (H2O2)? Use the conversion factor 1 mole = molar mass * grams or 1 mole/ # grams. Use the correct Units because they must cancel out. Use the significant figure rules to write your final answer.  example of how this should be set up is attached.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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How many moles are represented by 4.0 grams of hydrogen peroxide (H2O2)?

Use the conversion factor 1 mole = molar mass * grams or 1 mole/ # grams. Use the correct Units because they must cancel out. Use the significant figure rules to write your final answer. 

example of how this should be set up is attached.

#1 How many liters are in 2.5 moles of hydrogen (H₂) at STP? 22.4 liters H₂ 2.5 moles H₂ x mole H₂ H 1 #2 How many moles of water vapor are in 4.3 L at STP? 1 mole H₂O 43LH₂0 × 22.4 liters H,0 liters H₂₁₂ 56 liters H, (sig figs applied! moles - 0.19 liters H₂O (sig figs applied! 22.4 H₂O
Transcribed Image Text:#1 How many liters are in 2.5 moles of hydrogen (H₂) at STP? 22.4 liters H₂ 2.5 moles H₂ x mole H₂ H 1 #2 How many moles of water vapor are in 4.3 L at STP? 1 mole H₂O 43LH₂0 × 22.4 liters H,0 liters H₂₁₂ 56 liters H, (sig figs applied! moles - 0.19 liters H₂O (sig figs applied! 22.4 H₂O
01 ▶▶ 02 03 >> 04 >> 05 >> Significant Figure Rules Rules All nonzero digits are significant. Zeros that appear between other nonzero digits are always significant. Zeros that appear in front of all of the nonzero digits are called left-end zeros. Left-end zeros are never significant. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that lacks a decimal point are not significant. Right-end zeros in a number with a decimal point are significant. This is true whether the zeros occur before or after the decimal point. 237 has three significant figures. 1.897 has four significant figures. 39,004 has five significant figures. 5.02 has three significant figures. 0.008 has one significant figure. 0.000416 has three significant figures. 140 has two significant figures. 75,210 has four significant Ligures. 620.0 has four significant figures. 19.000 has five significant figures. For multiplication and division problems, the answer should be rounded to the same number of significant figures as the measurement with the least number of significant figures.
Transcribed Image Text:01 ▶▶ 02 03 >> 04 >> 05 >> Significant Figure Rules Rules All nonzero digits are significant. Zeros that appear between other nonzero digits are always significant. Zeros that appear in front of all of the nonzero digits are called left-end zeros. Left-end zeros are never significant. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that lacks a decimal point are not significant. Right-end zeros in a number with a decimal point are significant. This is true whether the zeros occur before or after the decimal point. 237 has three significant figures. 1.897 has four significant figures. 39,004 has five significant figures. 5.02 has three significant figures. 0.008 has one significant figure. 0.000416 has three significant figures. 140 has two significant figures. 75,210 has four significant Ligures. 620.0 has four significant figures. 19.000 has five significant figures. For multiplication and division problems, the answer should be rounded to the same number of significant figures as the measurement with the least number of significant figures.
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