Question

8 molar;1.5ml hno3 aqoues solution.find out mass of hno3 present in solution.

Answer 1

Hello!

We have the following data:

M (molarity or Molar Concentration) = 8 Molar (Mol/L)
m1 (mass of the solute HNO3) = ? (in grams)
V (volume) = 1.5 mL → 0.0015 L
MM (molar mass of HNO3)
H = 1*1 = 1 u
N = 1*14 = 14 u
O = 3*16 = 48 u
----------------------
MM (molar mass of HNO3) = 1 + 14 + 48 = 63 g/mol

We apply the data to the molar concentration formula, see:

$M = \dfrac{m_1}{MM*V}$

$8 = \dfrac{m_1}{63*0.0015}$

$8 = \dfrac{m_1}{0.0945}$

$m_1 = 8*0.0945$

$\boxed{\boxed{m_1 = 0.756\:g}}\end{array}}\qquad\checkmark$

I Hope this helps, greetings ... DexteR!