For the equation 3cu + 8hno3 → 3cu(no3)2 + 2no + 4h2o, how many units of no3 are represented on the products side?

a) 2
b) 3
c) 6
d) 8

C) 6

Explanation:

We see that on the product side, the only substance containing some units of NO3 is

We see that there is a subscript _2 which means that we have 2 units of NO3, and then we can also see that there is a coefficient 3 in front of the substance, this means we should multiply by 3 the 2 units of NO3, so we get:

therefore we have 6 units of NO3 in total on the product side.

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.