Discussion
The mass of 10 litres of oxygen which has density of 1.43 g/L, will be :
Answer: C
The mass is 14.3 g.
Mass is density times volume:
\[ \begin{aligned} m &= \rho V \\ &= 1.43\ \text{g/L} \times 10\ \text{L} \\ &= 14.3\ \text{g} \end{aligned} \]
1.43 g is the mass of one litre only, and 10 g simply copies the volume as a mass. 1 g has no basis in the data. As a check, oxygen's density of 1.43 g/L at STP is its molar mass 32 g divided by the molar volume 22.4 L.
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