A student read that putting an extra 5 psi (pounds per square inch) of air into car tires helps it burn less fuel, so she decides to test this idea. She brings her car to a race track, fills the gas tank, and drives 100 miles. She then measures how much fuel she burned. She then adds another 5 psi of air to the tires, drives another 100
miles, and measures the fuel burned. She then compares the results.

What is the controlled variable:
1. The weather conditions during each test of 100 miles
2. The speed the car is driven on
3. The race track that the car is driven on
4. All of the above

Explain:

elements

explanation:

yes the other ones are right just show me a pic of ur face cuz u look hot

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este