1. Speed, since we know that , where s is speed, d is distance and t is time
2. Velocity, for velocity you need to consider the direction and displacement gives the direction of travel.
3. 25 mph, because
4. 50 mph east, velocity unlike speed has direction.
5.Velocity, displacement gives the formula direction.
6. 0, the displacement is zero so velocity is zero
7. It decreases, speed is inversely proportional to time
Answer:
Explanation:
Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.
Mathematically, it can be represented as -
1 mol (Na) 1 mol (Cl)
g/mol
In gram of NaCl, there is one mole of Na or
ions
In one gram of NaCl, there will be
sodium ions
In grams of NaCl, the number of sodium ions will be -
Heat required = 173 kJ
<h3>Further explanation</h3>Given
56.0 g of ice
Temperatur at 263 K(-10 C) to 400 K(127 C)
Required
Heat needed
Solution
1. raise the temperature(-10 C to 0 C)⇒c ice=2.09 J/g C
2. phase change (ice to water)⇒Heat of fusion water=334 J/g
3. raise the temperature(0 C to 100 C)⇒c water= 4.18 J/g C
4. phase change(water to vapor)⇒heat of vaporization water=2260 J/g
5. raise the temperature(100 C to 127 C)⇒c vapor=2.09 J/g C
Total heat :
1170.4+18704+23408+126560+3160.08=173,002.48 J=173 kJ