An object has a mass of 60 ounces and a volume of 30 cups. What is the density? oz/cup (your answer should *only* be a number, round to one decimal place if needed) *

2.0

Explanation:

Given data:

Mass of object = 60 ounce

Volume of object = 30 cups

Density = ?

Solution:

d = mass/ volume

d = 60 ounce/ 30 cup

d = 2.0 oz/cup

Thus, density of object is 2.0 oz/cup.

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

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