All categories

3 years ago

A 1.2 kg sample of Th-228 has a half-life of 1.9 years. How many grams of Th is left after 13.3 years?

Chemistry

1 answer:

Bumek [7]3 years ago

7 0

.009375 kg or 9.375 grams will remain

You might be interested in

Plan an investigation to explore the relationship between properties of substances and the electrical forces within those substa

kenny6666 [7]

Answer:

la verdad no se no ablo ingles solo espanis

8 0

2 years ago

Explain how the valence electrons are related to the element's period.

AlekseyPX

Answer:

The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next

5 0

2 years ago

What is the name of the supercontinent that existed 245 million years ago

Mandarinka [93]

I believe it was Pangaea but I could be wrong

6 0

3 years ago

Read 2 more answers

If temperature is held constant for an ideal gas, as P and V change for a given gas sample, the PV of products will_____. increa

vodka [1.7K]

Answer:

PV=nRT

Explanation:

V=RTn

rearrangement gives

PV=nRT
R=PV

where P=pressure

V=volume

n=number of moles

R=ideal gas(0.0820atmdm/3 mol/k)

T=temperature in kelvin

3 0

3 years ago

Read 2 more answers

Find the percentage composition of each element in the compound having 9.8 grams of nitrogen,0.7 grams of hydrogen and 33.6 gram

prisoha [69]

Answer: The percentage composition of nitrogen , hydrogen and oxygen is 22.2 % , 1.59 % and 76.2% respectively.

Explanation:

Percentage composition is defined as the ratio of mass of substance to the total mass in terms of percentage.

Percentage composition= $\frac{\text {mass of the element}}{\text {Total mass of the substance}}\times 100\%$

a) ${\text {percentage composition of nitrogen}}=\frac{\text {mass of nitrogen}}{\text {Total mass}}\times 100\%$

${\text {percentage composition of nitrogen}}=\frac{9.8g}{9.8+0.7+33.6}\times 100\%=22.2\%$

b) ${\text {percentage composition of hydrogen}}=\frac{\text {mass of hydrogen}}{\text {Total mass}}\times 100\%$

${\text {percentage composition of hydrogen}}=\frac{0.7}{9.8+0.7+33.6}\times 100\%=1.59\%$

c) ${\text {percentage composition of oxygen}}=\frac{\text {mass of oxygen}}{\text {Total mass}}\times 100\%$

${\text {percentage composition of oxygen}}=\frac{33.6}{9.8+0.7+33.6}\times 100\%=76.2\%$

The percentage composition of nitrogen , hydrogen and oxygen is 22.2 % , 1.59 % and 76.2% respectively.

4 0

2 years ago