Answer: 6.0 g of silicon has more atoms
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
To calculate the moles, we use the equation:
a) 
1 mole of Si contains = atoms
0.21 moles of Si contains = 
atoms
b) 
1 mole of Fe contains = atoms
0.11 moles of Fe contains = 
atoms
Thus 6.0 g of silicon has more atoms
Yesn’t. they are either wrong or links
Answer: increasing the number of collisions between reactants
Explanation:
A reaction is possible due to collisions between the reactants to create products. If we increase the concentration of reactants then that means that we are increasing the molecules of the reactants which would give them more chances to collide and make products.
For instance, using a non-chemistry example, if there are few cars in a large city, the accidents there will be less because the cars will have such space that they wouldn't collide with each other. If the number of cars in the city is increased however, there is now less space and more chances for cars to collide.
Answer:
63.5 g
Explanation:
Given data:
Number of moles of iodine needed = 0.250 mol
Mass to be measured = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of diatomic iodine = 253.8 g/mol
by putting values,
0.250 mol = mass / 253.8 g/mol
Mass = 0.250 mol × 253.8 g/mol
Mass = 63.5 g
Thus, student need to be measured 63.5 g of iodine.
