Molar Mass Sig Figs

[AustinMcBrideDis3L]

Does anyone know how many sig figs we should take from the molar masses on the periodic table for our homework and problems? Also which is preferred: rounding or truncating?

[Ryan_Kien_1L]

I think the general rule of thumb is to go with 4 sig figs off the periodic table and to go with rounding.

[Stacey Phan 2I]

When you write the molar masses from the periodic table, people typically use four sig figs (to the hundredths place).

[Peter DePaul 1E]

My chemistry and AP Chem teachers taught us to use 4 sig figs

[Nina Tartibi 1F]

I believe it is 4 decimal places when dealing with chemical substances and problems.

[Yuehan_Wu_3K]

4 decimal will be fine for the most situations.

[David Jen 1J]

I also use 4 sig figs.

[Linette Choi 3L]

Typically I use exactly the molar mass that is given from my periodic table (which rounds the decimals to the hundredth place). However, using 4 decimal places is a safer method to get a more accurate answer.

[joshtully]

I do 2 sig figs after the decimal point, which usually means 4 sig figs total.

[805421690]

I usually keep it to three, unless the fourth one is higher than five. If it is I just keep it to if I am calculating that number, but if its for the final answer I just round it up or drop it. Hope that helps