3 years ago

What is the mass of a 4.259 g/cm3 substance which takes up 250.00 cm3 of space? answer in significan figures

Chemistry

1 answer:

marysya [2.9K]3 years ago

4 0

Answer: that is wrong

Explanation:

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A sample of 28 Mg decays initially at a rate of 53500 disintegrations per minute, but the decay rate falls to 10980 disintegrati

prisoha [69]

Answer : The half life of 28-Mg in hours is, 6.94

Explanation :

First we have to calculate the rate constant.

Expression for rate law for first order kinetics is given by:

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant

t = time passed by the sample = 48.0 hr

a = initial amount of the reactant disintegrate = 53500

a - x = amount left after decay process disintegrate = 53500 - 10980 = 42520

Now put all the given values in above equation, we get

$k=\frac{2.303}{48.0}\log\frac{53500}{42520}$

$k=9.98\times 10^{-2}hr^{-1}$

Now we have to calculate the half-life.

$k=\frac{0.693}{t_{1/2}}$

$9.98\times 10^{-2}=\frac{0.693}{t_{1/2}}$

$t_{1/2}=6.94hr$

Therefore, the half life of 28-Mg in hours is, 6.94

8 0

3 years ago

What is the force on a 1000 kg elevator that is falling freely at 9.8/sec2

Mamont248 [21]

1,000 x 9.8 = 9800 Newtons

hope this helps

5 0

2 years ago

How many grams does 1.0 liter of motor the density of motor oil is 0.80g / mL

balandron [24]

I think the answer is 1.25 grams actually i think i’m wrong

5 0

2 years ago

A graduated cylinder had 20mL of water. A sample of pyrite was placed in the cylinder and the volume moved to 35 mL. What is the

Ksju [112]

15mL because if it started as 20 mL and went to 35mL when u put in pyrite, the pyrite takes up 15mL

4 0

3 years ago

A mass of 2kg has a kinetic energy of 16J.what is the momentum of the body?

juin [17]

Explanation:

mass -2kg

energy -16j

k.e -1/2mv

16j= 1/2×2×V

16× 2/2 =V

16 = V

√16= V

V= 4m/s

Then

momentum=MV

=2×4

=8kgm/s

3 0

3 years ago