All categories

3 years ago

How many atoms are in 0.8 mols of lead? show work.

Chemistry

1 answer:

liubo4ka [24]3 years ago

6 0

1 mole -------------- 6.02x10²³ atoms
0.8 moles ---------- ?

atoms = 0.8 * 6.02x10²³ / 1

= 4.816x10²³ atoms

You might be interested in

A/an _______ bond allows metals to conduct electricity

k0ka [10]

A bond allows metal to conduct electricity <span />

5 0

3 years ago

Read 2 more answers

What do you need to do to get larger sugar crystals?

Brilliant_brown [7]

Let the solution cool down really slowly, don’t disturb it at all.

5 0

3 years ago

How many moles of hcl are present in 40.0 ml of a 0.035 m solution?

Elden [556K]

Answer:

0.0014 moles is present in 40cm³ of 0.035M of HCl solution

Explanation:

Molarity = 0.035M

V = 40.0mL

1mL = 1cm³

V = 40cm³

0.035 moles = 1000cm³

X moles is present in 40cm³

X = (40 * 0.035) / 1000

X = 0.0014moles

0.0014 moles is present in 40cm³ of solution

8 0

3 years ago

Which of the following groups gets energy directly from an insect that it eats?

ASHA 777 [7]

C. Primary consumers

Explanation:

Producers are like grass, herbivore is like a cricket and primary consumers is like a bird

8 0

3 years ago

Read 2 more answers

A mileage test is conducted for a new car model. Thirty randomly selected cars are driven for a month and the mileage is measure

Leni [432]

Answer: $(27.81,\ 29.39)$

Explanation:

Given : Sample size : n= 30 , it means it is a large sample (n≥ 30), so we use z-test .

Significance level : $\alpha: 1-0.95=0.05$

Critical value: $z_{\alpha/2}=1.96$

Sample mean : $\overline{x}=28.6$

Standard deviation : $\sigma=2.2$

The formula to find the confidence interval is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

i.e. $28.6\pm (1.96)\dfrac{2.2}{\sqrt{30}}$

i.e. $28.6\pm 0.787259889321$

$\approx28.6\pm 0.79=(28.6-0.79,28.6+0.79)=(27.81,\ 29.39)$

Hence, the 95% confidence interval for the mean mpg in the entire population of that car model = $(27.81,\ 29.39)$

4 0

3 years ago