**The number of grams : 17.082 g**

<h3>Further explanation</h3>

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

453.9 mL of 0.237 M calcium acetate

MW Ca(C₂H₃OO)₂ : 158,17 g/mol

The balanced equation for the above reaction is as follows

CaCO₃ + 2HBr ---> CaBr₂ + CO₂ + H₂O

stoichiometry of CaCO₃ to HBr is 1:2

number of moles of CaCO₃ reacted - 5.64 g / 100 g/mol = 0.0564 mol

according to molar ratio

number of HBr moles - 0.0564 mol x 2 = 0.1128 mol

number of HBr moles in 250.0 mL - 0.1128 mol

therefore number of HBr moles in 1000 mL - 0.1128 mol / 250.0 mL x 1000 mL = 0.4512 mol

molarity of HBr - 0.4512 M

Convert all of the units from centimeters to meters by moving the decimal point over to the left two digits.

0.15 m x 0.06 m x 0.12 m

Volume = length x width x height

= 0.15 x 0.06 x 0.12 = 0.00108 m^3

**Answer:**

6.02×10^23 atoms

**Explanation:**

Avogadros constant is a number that states the amount of atoms in one mole of a substance which is 6.02×10^23 to 3 significant figures.