Copy of Two-Step Molar Conversion 2 (5/28/2026)

Last updated about 3 hours ago

12 questions

Copy of Two-Step Molar Conversion 2 (5/28/2026)

Last updated about 3 hours ago

12 questions

Significant Figures (Sigfigs)
SigFig Rules:
All non-zero digits are significant (211.8 has four sigfigs).
Zeros between non-zero digits are significant (20007 has five sigfigs).
Leading zeros in a number are not significant (0.0085 has two sigfigs).
Trailing zeros are not significant unless there is a decimal in the number (0.0050 has two sigfigs; 4100.0 has five sigfigs).
Trailing zeros in a whole number without a decimal are not significant (1000 has one SigFig).
For conversions - use the same number of sigfigs as the original value.
Rounding after solving a problem:
If the original number was 2.140 x 107
Four sigfigs (2.140); therefore, the answer must also have four sigfigs.
If the product was 1.150672 x 105, then it would need to be rounded to 1.151 x 105.
Examples:
   0.00456   - 3 sigfigs
   2000  - 1 sigfig
   1.20 × 10²   - 3 sigfigs
   150.0   - 4 sigfigs

Draggable item		Corresponding Item

Draggable item		Corresponding Item

How many molecules are in 2.50 moles of NaCl?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many grams of CO2 are in 0.100 moles of it?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules of H2O are in 5.00 moles of it?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many grams are in 3.00 moles of C6H12O6?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules are in 0.250 moles of KCl?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules are in 50.0 grams of NaCl?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules are in 10.0 g of CO2?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules are in 25.0 g of H2O?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many molecules are in 100.0 g of C6H12O6?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

How many grams are in 5.00 x 1024 molecules of KCl?

Initial calculation (not rounded): _______ 
Calculation rounded using sigfigs: _______ 

Draggable item		Corresponding Item
5.678 + 2.4		4
12.22 - 0.002		3
3.00 x 4.5		3

Copy of Two-Step Molar Conversion 2 (5/28/2026)

Copy of Two-Step Molar Conversion 2 (5/28/2026)

Match the correct number of significant figures to each value.

How many significant figures will the answer to each have?