Which of the following is equivalent to 3.2 mg? a
3.2 x 10-15 ug
b 3.2 x 1015 ug
С
3.2 x 10-3 ug
d
3.2 x 10'ug

The options are not really clear, however, the answer is 3.2 × 10^3ug

Explanation:

Milligram (mg) and microgram (ug) are interconvertible measurements of mass or weight. One microgram (ug) is a millionth gram while one milligram (mg) is a thousandth gram.

Hence, one milligram is a thousandth microgram i.e. 1 mg = 1000 ug

Therefore, a measurement of 3.2mg in ug will be; 3.2 × 1000

= 3200

= 3.2 × 10^3 ug

Hence, an equivalent measurement of 3.2mg is 3.2 × 10^3ug.

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

the answer is   c.) 1575 j.

explanation: