Dissolved silica (SiO2) is supplied to the oceans by the weathering of silicate minerals and its residence time in the oceans is approximately 18,000 years. If the average river
concentration of SiO2 is 10.4 mg/kg and the river flux is about 4.6 x 1016 kg/yr, what is
the steady state concentration of SiO2 (ppm)? (the mass of the ocean is approximately 1.4
x 1021 kg.).

How many joules of heat are required to raise thetemperature of 750 g of water from 11.0 °c to 19.0 °c?

Under what conditions will a gas be most likely to exhibit the ideal gas properties predicted by the ideal gas law? 1)high pressures and high temperature, because particles are forced closer together with higher kinetic energy, so intermolecular forces of attraction are weaker 2)high pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant 3) low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker 4)low pressure and low temperature, because particles are spread farther apart with lower kinetic energy, so the volume of the particles is less significant

Just on number 2 (all parts), and if you do answer explain in detail