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## How many moles are in MgO?

How many MgO formula units does such a mass represent? To find the molar quantity, we simply divide the mass by the molar quantity, to get an answer in moles : Moles of MgO = **42.5⋅g 40.3⋅g ⋅mol−1**=1.05⋅mol .

## How many moles are there in 40 g of magnesium oxide?

In the question the given mass of magnesium oxide MgO is given as 42.5grams. Hence the number of moles present in 42.5 grams of magnesium oxide are **1.0625moles**.

## 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 moles are in 50 grams of sodium?

Na has an atomic mass of 23 and Cl is 35.5. So the Mr(NaCl)= 23 + 35.5 = 58.5. Putting all of this into our moles equation gives us the answer: moles= 50/58.5 = **0.855 moles** (3sf).

## How many moles are in 50 grams of carbon?

Explanation: The answer is **44.0095**.

## What is the formula for moles to grams?

Moles to Grams Conversion Formula. In order to convert the moles of a substance to grams, you will need to **multiply the mole value of the substance by its molar mass**.

## How many moles of oxygen are in 100g of water?

There are 5.55 moles of water in 100g of it. There are **6.25 moles** of oxygen in 100g of Water.

## How many moles are in 5g of h2o?

Water consists of two hydrogen atoms connected to one oxygen atom, therefore molecular mass of water (M) is equal to sum of molecular masses of oxygen and two hydrogen atoms which is 2×1. 01 +15.99. Therefore molecular mass of water (M) is equal to 18,01. So in 5g sample of water there is **1.67 x 10 ^{23} water molecules**.