## Why do we always need grams when solving a problem?

Jose Robles 1D
Posts: 100
Joined: Fri Aug 02, 2019 12:15 am

### Why do we always need grams when solving a problem?

For instance, say when we are given milligrams, why don't we solve in that unit rather than convert to grams first?

eduardomorales5
Posts: 77
Joined: Fri Aug 30, 2019 12:15 am

### Re: Why do we always need grams when solving a problem?

It is the accepted base SI unit that helps to standardize measurements so that scientists can more easily compare their findings using the same unit measurement.

zoedfinch1K
Posts: 57
Joined: Thu Jul 25, 2019 12:16 am

### Re: Why do we always need grams when solving a problem?

eduardomorales5 wrote:It is the accepted base SI unit that helps to standardize measurements so that scientists can more easily compare their findings using the same unit measurement.

Even more, think about the lab setting. Chemists will typically measure the amount of substance needed in grams.

305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

### Re: Why do we always need grams when solving a problem?

Also, molar mass units are grams/mole; in order to perform dimensional analysis and get to your desired units and answer, you need the correct measurement units to be able to cancel correctly.

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: Why do we always need grams when solving a problem?

The unit conversion is necessary for dimensional analysis. In a calculation that requires the use of a molecule's molecular weight, we cannot simply go from mg to moles. The mg nor the g would cancel out.

Mellanie Gamero 4D
Posts: 10
Joined: Tue Oct 01, 2019 12:16 am

### Re: Why do we always need grams when solving a problem?

Using grams is essential because the unit of measurement for a molar mass consists of grams per mole. Therefore, given a mass measured in grams as well as a corresponding molar mass, enables you to find the mole of an element/compound. So this would make it much more simple to make a conversion between a mass and mole.

McKenna_4A
Posts: 115
Joined: Sat Aug 24, 2019 12:18 am

### Re: Why do we always need grams when solving a problem?

Jose Robles 1D wrote:For instance, say when we are given milligrams, why don't we solve in that unit rather than convert to grams first?

It's the SI unit. You can use other mass units but in the future, when we start dealing with more complicated measurements and units, it gets risky because they won't line up. It's best to use grams in calculations and convert into other units afterwards.