What is the pressure on a swimmer $20 \, m$ below the surface of water in $atm$?

The endosperm in angiosperms develops from

Which of the following has the lowest thermal stability?

$\int_{0}^{2\pi} (\sin x + |\sin x|) \, dx = $

How many $sp^2$ and $sp$-hybridised carbon atoms are present respectively in the following compound?

Calculate $\Delta H$ in $kJ$ for the following reaction:
$C_{(g)} + O_{2(g)} \longrightarrow CO_{2(g)}$
Given that:
$H_2O_{(g)} + C_{(g)} \longrightarrow CO_{(g)} + H_{2(g)} ; \Delta H = +131 \ kJ$
$CO_{(g)} + \frac{1}{2} O_{2(g)} \longrightarrow CO_{2(g)} ; \Delta H = -282 \ kJ$
$H_{2(g)} + \frac{1}{2} O_{2(g)} \longrightarrow H_2O_{(g)} ; \Delta H = -242 \ kJ$