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## How many moles are in 46 grams of sodium?

No of moles = known mass of a substance/ molar mass of the substance. So in 46 grams, **2 moles** of Na are present.

## How the atomic mass of sodium is 23?

Mass number = Total number of protons + Total number of neutrons Sodium atom has 11 protons and 12 neutrons in its nucleus. Thus, we get the atomic mass number 11 + 12 = 23. The atomic mass of sodium is defined by the number of massive nuclear particles. Na has the atomic mass number 23, so its atomic mass is **23 amu**.

## How many atoms does 23 grams of sodium have?

There are **6.02*10^23 atoms** in each mole (Avagadro no.) That is x moles * avagadro no. According to that, in 23 grams of sodium we have 6.02*10^23 atoms of Na.

## How do u calculate number of moles?

So in order to calculate the number of moles of any substance present in the sample, we simply **divide the given weight of the substance by its molar mass**. Where ‘n’ is the number of moles, ‘m’ is the given mass and ‘M’ is the molar mass.

## How many moles is in water?

The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of **one mole** of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol. Notice that the molar mass and the formula mass are numerically the same.

## What is atomic mass unit the atomic mass of sodium is 23 what does it mean?

Gram atomic mass is the atomic mass in grams or mass of one mole of the substance. Given the atomic mass of sodium is 23. The gram atomic mass of sodium is the atomic mass in grams. So the gram atomic mass of sodium is **23g**. Therefore, option A is correct.

## What is sodium-23 used for?

sodium nitroprusside an antihypertensive agent used in the treatment of **acute congestive heart failure and of hypertensive crisis** and to produce controlled hypotension during surgery; also used as a reagent.

## How many atoms are in 1g of sodium?

1 gram of sodium contains atom => 1/23 = **0.043478260 gram atom**.

## How many atoms are in 20g of sodium?

1 mole of Na=6.022*10^23 atoms. therefore in 20g of sodium **5.22*10^23 atoms** are present.