Question

periodic table
what is the density of carbon monoxide gas at stp conditions?
a 1.3 g/l
b 0.75 g/l
c 28 g/l
d 22.4 g/l

Explanation:

Step1: Recall the formula for density of gas at STP

The formula for density ($
ho$) of a gas at STP (Standard Temperature and Pressure) is $
ho=\frac{M}{V_m}$, where $M$ is the molar mass of the gas and $V_m = 22.4\ L/mol$ (molar volume at STP).

Step2: Find the molar mass of carbon monoxide ($CO$)

The molar mass of $C$ is $12\ g/mol$ and the molar mass of $O$ is $16\ g/mol$. So, for $CO$, $M=(12 + 16)\ g/mol=28\ g/mol$.

Step3: Calculate the density

Using the formula $
ho=\frac{M}{V_m}$, substitute $M = 28\ g/mol$ and $V_m=22.4\ L/mol$. Then $
ho=\frac{28\ g/mol}{22.4\ L/mol}=1.25\ g/L\approx1.3\ g/L$ (rounded to one - decimal place).

Answer:

A. 1.3 g/L