**Contents**show

## How many grams are in 3.5 moles?

The mass of 3.5 moles of Ca is **140 g** to two significant figures.

## How many grams of oxygen are there in 2.5 moles of oxygen atoms?

=2.5×16= **40g**. `

## How many grams are in oxygen?

One mole of oxygen gas, which has the formula O2, has a mass of **32 g** and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

## How many grams are in 4 moles of oxygen?

4 moles of oxygen gas would be equivalent to 4 moles x 32 g/mole = **128 g**. Thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.

## How many grams are in a mole?

The mass of one mole of a substance is **equal to that substance’s molecular weight**. For example, the mean molecular weight of water is 18.015 atomic mass units (amu), so one mole of water weight 18.015 grams.

## How many oxygen molecules are in 3 moles of oxygen?

You have 3 moles, so there are **3×6.022×1023 oxygen molecules** .

## How many moles is CH4?

(molar mass CH4 = 16.0 g/mol] G: **1.58 moles** CH4 D: ?

## What is the volume of 3 moles of o2 at STP?

3 moles of oxygen at STP will occupy a volume of 3×22. 4=**67.** **2 L**.