Question

How much salt (nacl) is carried by a river flowing at 30.0 m3/s and containing 50.0 mg/l of salt? give your answer in kg/day?

Answer 1

The river carries 129600 kg of salt per day, calculated by converting the flow rate and salt concentration to kilograms and then multiplying by the number of seconds in a day.

Step-by-step explanation:

To calculate the amount of salt (NaCl) carried by the river per day, we first need to determine the total mass of salt flowing per second and then convert that to kilograms per day. We are given the flow rate of the river as 30.0 m3/s and the concentration of salt is 50.0 mg/L. Since there are 1000 liters in 1 cubic meter, we multiply the flow rate by the concentration to get the mass flow rate in mg/s. Then, we convert this to kg/day.

Mass of salt per second = 30.0 m³/s × 50.0 mg/L × 1000 L/m³ = 1,500,000 mg/s

Convert mg to kilograms (there are 1,000,000 mg in a kg): 1,500,000 mg/s = 1.5 kg/s

Now to find kg per day, we multiply by the number of seconds in a day (86400 seconds/day):

Total salt per day = 1.5 kg/s × 86400 s/day = 129600 kg/day

Therefore, the river carries 129600 kg of salt per day.

Answer 2

Answer: 129,600kg/day
In this question, you are given the river flow (30m3/s) and the salt concentration. Then to determine the amount of salt carried, you simply need to multiply the flow with concentration. Be careful because the unit in this question is different and need to be converted. The equation would be:

Salt = river flow x salt concentration
Salt = 30m3/s x 1000L/m3 x 50mg/L = 1,500,000mg/second

Then convert it into kg/day
Salt= 1,500,000mg/second x 10^-6 kg/mg x (3600 second/hour) x (24 hour/day)= 129,600kg/day