If a tiny marble has a radius of 0.25mm how many marbles can be lined up across the circumference of the earth, distance of 24900 miles?

Answer : The number of marbles lined up across the circumference of the earth can be, marbles

Explanation :

First we have to calculate the diameter of tiny marble.

r = radius of marble = 0.25 mm

Now we have to calculate the number of marbles can be lined up across the circumference of the earth.

Given:

Circumference of the earth distance =

conversion used:

Number of marbles can be lined up = marbles

Thus, the number of marbles lined up across the circumference of the earth can be, marbles

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.