Tekanan osmosis darah manusia pada suhu 37^circ mathrm(C) adalah 7,7 atm. Seorang perawat akan membuat cairan infus yang isotonik dengan darah, caranya adalah dengan melarutkan sejumlah mathrm(NaCl)(mathrm(Mr)=58,5) ke dalam air. Massa mathrm(NaCl) yang diperlukan untuk membuat 250 mathrm(~mL) cairan infus adalah (mathrm(R)=0,08) A 2,27 mathrm(gr) B 4,54 mathrm(gr) . C 19 mathrm(gr) . D 38 mathrm(gr) .

Question

Answer 1

### A. 2.27 grams

Answer 2

## Step 1: Understanding Osmotic Pressure Formula### The osmotic pressure (

) can be calculated using the formula

, where

is the van't Hoff factor,

is the molarity,

is the gas constant, and

is the temperature in Kelvin.## Step 2: Converting Temperature to Kelvin### Convert the given temperature from Celsius to Kelvin:

## Step 3: Identifying the Van't Hoff Factor for NaCl### For NaCl, which dissociates into two ions (Na

and Cl

), the van't Hoff factor

is 2.## Step 4: Solving for Molarity (M)### Rearrange the osmotic pressure formula to solve for molarity

:

### Substitute the given values:

### Calculate

:

## Step 5: Calculating the Mass of NaCl Needed### Use the molarity to find the moles of NaCl needed for 250 mL (0.25 L) of solution:

### Convert moles to grams using the molar mass of NaCl (

):

Pertanyaan